Koechel, the man who cataloged Mozart's music.

1. Eine Kleine Nachtmusik, K.525
2. Piano Sonata No. 16, K.545
3. Andante for Clavier in C, K.1
4. Horn Concerto No. 2, K.417
5. Concerto for Flute and Harp, K.299
6. Rondo alla Turca, K.331
7. Lullaby, K.350
8. Flute Quartet No. 4, K.298
9. Symphony No. 41, "Jupiter", K.551
10. Requiem in D minor, K.626

Here are 333 that I could find on a song listing site:

"Eine Kleine Nachtmusik", Serenade in G Major, K. 525: IV. Rondo: Allegro

'Eine Kline Nachtmusik' Serenade No.13 In G Major 4th Movement

A Little Night Music - Allegro (Mozart)

A Little Night Music - Menuetto (Mozart)

A Little Night Music - Romance (Mozart)

A Little Night Music - Rondo (Mozart)

A varázsfuvola / Die Zauberflöte - Az Éj királynõje áriája (II. felv.) / Aria of the "Königin der Nacht" Act 2: Der Hölle Rache kocht in meinem Herzen

Abduction from Seraglio

Act I: Finale

Adagio and Fugue in C minor for Strings, K. 546

Adagio and Fugue in C Minor for Strings, K. 546: II. Fugue

Adagio In B Minor, K. 540

Adagio in E For Violin And Orchestra

Adante from Symphony #29

Ah, Vous Dirai-je Maman Twinkle Twinkle Little Star

Aleluya

Andante

Andante from String Quartet In D Major, K. 575

Andante in C for Flute & Orchestra, K. 315

Andante In C, K 315

Andante in F for a Small Mechanical Organ, K. 616

Apollo Et Hyacinthus K.38

Ave Verum

Ave Verum Corpus

Ave Verum Corpus (feat. Julian Leaper and Anne Dudley)

Ave verum corpus, K. 618

Ave Verum Corpus, K.618

Ave verum Preghiera From Mozartiana Suite

Bassoon Concerto, K 191. 1st Mov.. Allegro

Bastien Und Bastienne K.50

Batti, batti, o bel Masetto

Batti, batti, o bel Masetto (3'34)

Bei Ma¨nnem Welche Liebe Fu¨hlen

Cantata, Bwv 147: Choral: 'Jesu Bleibet Meine Freude'

Carnaval

Chorale Prelude, Bwv 599: Nun Komm, Der Heiden Heiland

Chorale Prelude, Bwv 639: Ich Ruf Zu Dir, Herr Jesu Christ

Clarinet Concerto In a Major - Slow Movement

Clarinet Concerto In A Major, Ii. Adagio

Clarinet Concerto In a Major, K. 622: Ii. Adagio

Clarinet Concerto in A, K. 622, 2nd Movement

Clarinet Concerto in A, K. 622: II. Adagio

Clarinet Concerto In A, K.622

Clarinet Quintet in A Major ("Stadler") K. 581: II. Larghetto

Classical Yoga Posture - Fluid and Elegant

Concerto for Clarinet and Orchestra in A Major K. 622, second Mov.ement, Adagio.

Concerto for Flute & Harp In C Major, K. 299: Ii. Andantino

Concerto for Flute and Harp

Concerto for Flute and Harp - Andantino

Concerto for Flute and Harp In C Major, K. 299: Ii. Andantino

Concerto For Flute And Orchestra In D Major, K 314 - I. Allegro Aperto

Concerto For Flute And Orchestra In D Major, K 314 - II. Andante Ma Non Troppo

Concerto For Flute And Orchestra In D Major, K 314 - III. Allegro

Concerto for Piano and Orchestra No. 21: Andante (From the Spy Who Loved Me)

Concerto for Two Pianos & Orchestra in E flat, K. 365-Allegro

Concerto for Violin and Orchestra No. 2 In D Major, KV 211: III. Rondeau

Concerto In C For Flute & Harp, K 299 - II. Andantino

Cosi Fan Tutte K.588

Cosi fan tutte, K. 588: "Soave sia il vento" (From "Closer")

Cosi Fan Tutte: "Un' Aura Amorosa"

Cosi` Fan Tutte

Cum Sancto Spiritu

Dance In the House

Der Schauspieldirektor K.486

Des Irae - Requiem

Die Entfuhrung Aus Dem Serail (Abduction from the Seraglio), K. 384: Die Entführung Aus Dem Serail, K. 384: Overture

Die Entfuhrung Aus Dem Serail K.384

Die Zauberflöte (The Magic Flute), K. 620: Der Hölle Rache

Dies Irae

Divertimento I: Adagio

Divertimento I: Allegro

Divertimento I: Menuetto

Divertimento I: Menuetto: Allegretto

Divertimento I: Rondo: Allegro

Divertimento II: Allegro

Divertimento II: Larghetto

Divertimento II: Menuetto

Divertimento II: Rondo

Divertimento III: Adagio

Divertimento III: Allegro

Divertimento III: Menuetto

Divertimento III: Rondo: Allegro Assai

Divertimento in D K251 - Andantino

Divertimento In F, K. 138, 1st Movement

Divertimento in F, K.138: 3. Presto

Divertimento IV: Adagio

Divertimento IV: Allegretto

Divertimento IV: Allegro

Divertimento IV: Larghetto

Divertimento IV: Menuetto

Divertimento No. 1 in D, K. 136, 1st Movement

Divertimento V: Adagio

Divertimento V: Menuetto

Divertimento V: Polonaise

Divertimento V: Romance: Andante

Don Giovanni K.527

Eine Kleine Nachtmusik

Eine Kleine Nachtmusik (A Little Night Music)

Eine Kleine Nachtmusik - Allegro

Eine Kleine Nachtmusik - Seranade No. 13 In G Major - 1st Movement

Eine Kleine Nachtmusik - Serenade No.13 In G Major 4th Movement (as heard in Ace Ventura: When Nature Calls)

Eine Kleine Nachtmusik K 525 - Romance

Eine Kleine Nachtmusik Serenade #13 In G, K 525, -2 Romanze: Andante

Eine Kleine Nachtmusik, K. 525 (Serenade No. 13 In G Major for Strings): IV. Rondo. Allegro

Eine kline Nachtmusik - Serenade No.13 In G Major 4th Movement (as heard in Ace Ventura: When Nature Calls)

Eine kline Nachtmusik' Serenade No.13 In G Major 4th Movement

Eine kline Nachtmusik' Serenade No.13 In G Major 4th Movement (as heard on Ace Ventura: When Nature Calls)

Elvira Madigan

Evening Mood

Exsultate, jubilate, K. 165: I. Exultate, jubilate

Exsultate, jubilate, K. 165: II. Fulget amica dies

Exsultate, jubilate, K. 165: III. Tu virginum corona

Exsultate, jubilate, K. 165: IV. Alleluia

Fantasy In D Minor K397

Feeling

Flute Concerto In D Major, K 314 - Allegro

Flute Concerto No. 2 - Adagio non troppo

Flute Quartet In A, K 298 - II. Menuetto

Flute Quartet In G, K 285A - II. Tempo Di Menuetto

Flute Quartet No. 1 in D, K. 285, 1st Movement

Generation

Gente, Gente, All'Armi, All'Armi (From "The Marriage of Figaro") [Live 1937 Recording]

Gloria

Happy day

Horn Concerto No. 3 in E-Flat, K. 447, 2nd Movement

Horn Concerto No. 4

Horn Concerto No.4 in E-Flat Major, K.495: II. Romanza (Andante)

Idomeneo K.366

Ii. Adagio

Il Re Pastore K.208

Impromptu In E Flat (D.899) No.2

Impromptu In G Flat (D.899) No.3

La Clemenza Di Tito K.621

La Finta Giardiniera K.196

La Flauta Magica.Obertura

Laudate Dominum

Le Nozze Di Figaro (The Marriage of Figaro), Overture, K. 492

Le Nozze Di Figaro, K 492 - Overture

Le Nozze Di Figaro, K. 492, Act I: Overture

Le Nozze Di Figaro, K. 492: Overture

Le Nozze di Figaro: "Overture"

Let the Music Move Me

Longe Dos Olhos

Lucio Silla K.135: Andante

Lucio Silla K.135: Molto Allegro

Magic Flute K.620

March Alla Turca

Marriage Of Figaro K.492

Marriage of Figaro: Se Vuol Ballare

Mass in C Major, K. 317 - "Coronation": II. Gloria

Mauerische Trauermusik

Mauerische Trauermusik k447

Mitridate, Re Di Ponto K.87: Allegro

Mitridate, Re Di Ponto K.87: Andante Grazioso

Mitridate, Re Di Ponto K.87: Presto

Motette in D, "Ave Verum Corpus", K. 618

Mozart

Mozart massacre

Mozart's Variations On Ah Vous Dirai-je Maman, K265/300e: VIII

Mozart: Don Giovanni Suite KV 527 - (7) Vedrai, carino

Mozart: Gran Partita - (3) Adagio

Mozart: Great G Minor Symphony No. 40, K. 550 - (1) Molto Allegro

Mozart: Piano Concerto No. 16 in D Major, K. 451 - (1) Allegro Assai

Mozart: Piano Concerto No. 17 in G Major No. 17, K. 453 - (3) Allegretto

Mozart: Piano Concerto No. 21 in C Major, KV 467 - (3) Allegro vivace assai

Mozart: Piano Concerto No. 25 in C Major, KV 503 - (2) Andante

Mozart: Piano Concerto No. 26 in D Major, KV 537 "Coronation" - (2) Larghetto

Mozart: Piano Concerto No. 6 in B Flat Major, K. 238 - (3) Rondeau. Allegro

Mozart: Piano Concerto No. 6 in B Flat Major, KV 238 - (3) Rondeau - Allegro

Mozart: Piano Sonata No. 12 in F Major, K. 332 - (1) Allegro

Mozart: Symphony No. 36 in C Major, KV 425 "Linz - (4) Finale (Presto)

Nachtmusik 1

Oboe Concerto In C - Adagio Non Troppo

Oboe Concerto, K 314. 3rd Mov.. Rondo: Allegretto

Overture The Magic Flute K. 620

Overture "The Magic Flute" K. 620

Overture to Le Nozze Di Figaro, Ossia la Folle Giornata (The Marriage of Figaro)

Pa-pa-pa-pa-pa-pa-Papagena!

Partita No.1 In B-Flat, Bwv 825: Allemande

Partita No.1 In B-Flat, Bwv 825: Gigue

Partita No.1 In B-Flat, Bwv 825: Menuets I&II

Partita No.1 In B-Flat, Bwv 825: Prelude

Partita No.1 In B-Flat, Bwv 825: Sarabande

Piano Concerto 21

Piano Concerto No. 21 (II.)

Piano Concerto No. 21 In C Major, "Elvira Madigan": Ii. Andante

Piano Concerto No. 21 In C Major, K. 467, "Elvira Madigan": Ii. Andante

Piano Concerto No. 21 in C, K. 467-Andante

Piano Concerto No. 23 - Andante

Piano Concerto No. 26 in D, "Coronation", K. 537, 2nd Movement

Piano Concerto No. 26 in D, K. 537, "Coronation"-Larghetto

Piano Concerto No. 26 in D, K. 537, Coronation Larghetto

Piano Concerto No. 3 In C Minor, Op. 37: III. Rondo - Alllegro

Piano Concerto No. 9 in E-Flat Major, K271: I. Allegro

Piano Concerto Number 21, Elvira Madigan (Andante)

Piano Quartet K. 478: II. Andante

Piano Quartet K. 478: III. Rondo. Allegro Moderato

Piano Quartet K. 493: III. Allegretto

Piano Sonata in B-flat major, KV333

Piano Sonata No. 10 In C Major, K. 330, II. Andante

Piano Sonata No. 11 In A Major, K. 331: Iii. Rondo Alla Turca: Allegretto

Piano Sonata No. 12 in F, K. 332, 2nd Movement

Piano Sonata No. 16 In C

Piano Sonata No. 16 In C Major, K. 545 (I. Allegro, II. Andante, III. Rondo)

Piano Sonata No. 16 In C Major: Sonata Facile - I. Allegro

Piano Sonata No. 19 In D Major, K. 576, III. Allegretto

Piano Sonata Number 11 In A, K 331 (Rondo Alla Turca)

Piano Sonata Number 16 In C Major Sonata Facile

Pno Qt In E Flat: Allegretto

Pno Qt In E Flat: Largetto

Pno Qt In G: Andante

Pno Qt In G: Rondo: Allegro Moderato

Qnt In E Flat, K.452: Allegretto

Qnt In E Flat, K.452: Larghetto

Qnt In E Flat, K.452: Largo-Allegro Moderato

Qnt In E Flat, Op.44: Allegro Brillante

Qnt In E Flat, Op.44: Allegro, Ma Non Troppo

Qnt In E Flat, Op.44: In Modo D'una Marcia. Un Poco Largamente

Qnt In E Flat, Op.44: Scherzo: Molto Vivace-Trio I-Trio II-Li'istesso Tempo

Quatuor en Ré, KV 285: II. Adagio

Quintet for clarinet and String quartet, K 581. The 2nd Mov.. Larghetto

Requiem - Rex Tremendae Majestatis

Requiem In D Minor, K 626 - 1. Introitus: Requiem Aeternam

Requiem In D Minor, K 626 - 6. Sequentia: Recordare, Jesu Pie

Requiem, K. 622: Hostias

Requiem, K. 626: I. Introitus

Requiem, K. 626: II. Kyrie eleison

Requiem, K. 626: III. Sequentia: Confutatis

Requiem, K. 626: III. Sequentia: Dies irae

Requiem, K. 626: III. Sequentia: Lacrimosa

Requiem, K. 626: III. Sequentia: Recordare

Requiem, K. 626: III. Sequentia: Rex tremendae

Requiem, K. 626: III. Sequentia: Tuba mirum

Requiem, K. 626: IV. Offertorium: Domine Jesu Christe

Requiem, K. 626: V. Sanctus: Benedictus

Requiem, K. 626: V. Sanctus: Sanctus

Requiem, K. 626: VI. Agnus Dei

Requiem, K. 626: VII. Communio: Lux aeterna

Rondo (Fourth movement from Serenade in D major, KV250 'Haffner')

Rondo - Allegro

RRequiem, K. 626: IV. Offertorium: Hostias et preces

Salzburger Divertimento B-Dur KV 137, In B Flat Major (Allegro Assai)

Salzburger Divertimento D-Dur KV 136 / D Major K. 136 (Allegro)

Serenade #13 In G, K 525, "Eine Kleine Nachtmusik"

Serenade #13 In G, K 525, "Eine Kleine Nachtmusik" - 4. Rondo

Serenade #13 In G, K 525, Eine Kleine Nachtmusik (Rondo/ Allegro)

Serenade in G Major, "Eine kleine Nachtmusik" (A Little Night Music), K. 525: I. Allegro

Serenade No. 10 In B-flat Major, K. 361 "Gran Partita": Adagio

Serenade No. 13 in G Major "Eine Kleine Nachtmusik" KV 525: Rondo: Allegro (A Little Night Music)

Serenade No. 13 In G Major, "Eine Kleine Nachtmusik": Ii. Romanze: Andante

Serenade No. 13 In G Major, K. 525, "Eine Kleine Nachtmusik": I. Allegro

Serenade No. 13 In G Major, K. 525, "Eine Kleine Nachtmusik": Ii. Romanze: Andante

Serenade No. 13 in G Major, K.525 "Eine kleine Nachtmusik": I. Allegro

Serenade No. 13 in G, "Eine Kleine Nachtmusik", K. 525, 1st Movement

Serenade No. 13 in G, "Eine Kleine Nachtmusik", K. 525, 2nd Movement

Serenade No. 13, Eine Kleine Nachtmusik (A Little Night Music) for String Quartet & Bass in G major, K. 525: II. Romance: Andante

Serenade No. 13, K. 525 in G Major (Eine Kleine Nachtmusik) A Little Night Music: Allegro

Serenade No. 4 In D Major, K. 203: Andante

Serenade No. 9 in D, "Post Horn", K. 320, 6th Movement

Serenade No.10 in B-Flat Major, K.361 ""Gran Partita"": I. Largo - Molto Allegro

Serenade No.10 in B-Flat Major, K.361 ""Gran Partita"": II. Menuetto

Serenade No.10 in B-Flat Major, K.361 ""Gran Partita"": III. Adagio

Serenade No.10 in B-Flat Major, K.361 ""Gran Partita"": IV. Menuetto (Allegretto)/Trio 1/Trio 2

Serenade No.10 in B-Flat Major, K.361 ""Gran Partita"": V. Romance (Adagio-Allegretto-Adagio)

Serenade No.10 in B-Flat Major, K.361 ""Gran Partita"": VII. Finale - Molto Allegro

Serenade Number 13 In G, K 525, Eine Kleine Nachtmusik (Allegro)

Serenata Notturna, Serenade #6 In D, K 239, - 3. Rondo: Allegretto

Sinfonia Concertante for Oboe, Clarinet, Bassoon and Horn, KV Anh 9. 3rd Mov.. AndantiN° With Variazioni

Sonata in B-Flat Major, Kv454: I - Largo - Allegro

Sonata in B-Flat Major, Kv454: II - Andante

Sonata in B-Flat Major, Kv454: III - Largo - Allegro

Sonata In C

Sonata In D Minor (Kk.9) 'Pastorale'

Sonata In E (Kk.380)

Sonata K. 304 in e minor: Allegro

Sonata K. 304 in e minor: Tempo di Menuetto

Sonata K299c

Sonata K309

Sonata K311

Sonata No. 10 C major, KV 330 (1783) : I. Allegretto

Sonata No. 11 A major (Alla Turca) , KV 331 (1783) : II. Allegro Moderato

Sonata No. 12 F major, KV 332

Sonata No. 12 F major, KV 332 (1783) : II. Adagio

Sonata No. 13 Bb major, KV 333 (1783) : III. Allegretto Grazioso

Sonata No. 16 C major (Sonata facile) , KV 545 (1788) : I. Allegro

Sonata No. 17 Bb major, KV 570 (1789) : III. Allegretto

Sonata No. 8 D major, KV 311 (1777) : III. Rondo Allegro

Sonata No.2 In E-Flat For Flute & Harpsichord, Bwv 1031: II. Sicilliano

Sonata No.8 In A Minor (K.310): I. Allegro Maestoso

Str Qt In D, Op.64, No.5, Hob.III: 63 'The Lark': Adagio-Cantabile

Str Qt In D, Op.64, No.5, Hob.III: 63 'The Lark': Allegro Moderato

Str Qt In D, Op.64, No.5, Hob.III: 63 'The Lark': Menuetto: Allegretto

Str Qt In D, Op.64, No.5, Hob.III: Zs63 'The Lark': Finale: Vivace

Stretch and Release - Yoga Fitness to the Classics

String Quartet No. 17 in B-Flat, "Hunting", K. 458, 1st Movement

Suave Gentile from Cosi Fan Tutte

Symphony In G Minor, 3rd Movement

Symphony No. 25 - First Movement

Symphony No. 25 In G Minor, K. 183: I. Allegro Con Brio

Symphony No. 32 In G Major, K. 318

Symphony No. 40 (II.)

Symphony No. 40 In G Minor, K. 550: I. Molto Allegro

Symphony No. 40 in G Minor, KV 550: I. Allegro Molto

Symphony No. 41 "Jupiter"

Symphony No. 41 in C Major K, 551 'Jupiter' Finale- Molto Allegro

Symphony No. 41 in C Major K, 551 'Jupiter' Menuetto- Allegretto & Trio

Symphony No. 41 In C Major, K. 550, "Jupiter": Iv. Molto Allegro

Symphony No. 41 In C Major, KV 551 "Jupiter"

Symphony No.1 in E-Flat Major, K.16: I. Allegro molto

Symphony No.1 in E-Flat Major, K.16: II. Andante

Symphony No.1 in E-Flat Major, K.16: III. Presto

Symphony No.40 1

Symphony Number 40 In G Minor, K 550 (Molto Allegro)

Szöktetés a szerájból / Die Entführung aus dem Serail - Constanze áriája (II. felv.) / Aria of Constanze Act 2: Martern aller Arten

The Magic Flute: Ein Weibchen

The Marriage Of Figaro

The Marriage of Figaro (overture)

The Marriage of Figaro, K 492 (Overture)

The Queen of the Night

Titus Overture

Tune Up and Fanfare Based On Themes from "The Magic Flute"

Turkish March

Turkish March, Piano Sonata No. 11 in A Major, K 331 (Mozart)

untitled: Symphony In G Minor, K.550: I. Molto Allegro

untitled: the Magic Flute, K.620: "Overture"

untitled: the Magic Flute, K.620: "Queen of the Night Air"

untitled: the Marriage of Figaro, K.492: "Overture"

Variations On 'Father Christmas Is Comin'

Variations On Ah Vous Dirai-Je Maman, K265/300E: IV

Vesperae Solennes de Confessore, K. 339: Dixit Dominus from Vesperae Solennes de Confessore

Violin Concerto No. 5 In A Major, K. 219, "Turkish": Iii. Rondo: Tempo Di Minuetto

Violin Concerto No.4 In D, K218: I. Allegro

Vn Son No. 5 In F, Op. 24 'Spring': II. Adagio Molto Espressivo

• Symphony No. 1 in E-flat major, K. 16
• Symphony No. 2 in B-flat major, K. 17
• Symphony No. 3 in E-flat major, K. 18
• Symphony No. 4 in D major, K. 19
• Symphony No. 5 in B-flat major, K. 22
• Symphony No. 6 in F major, K. 43
• Symphony No. 7 in D major, K. 45
• Symphony No. 8 in D major, K. 48
• Symphony No. 9 in C major, K. 73/75a
• Symphony No. 10 in G major, K. 74
• Symphony No. 11 in D major, K. 84/73q
• Symphony No. 12 in G major, K. 110/75b
• Symphony No. 13 in F major, K. 112

Mozart wrote well over 1000 pieces of music. My personal favourites, though, are his Oboe Concerto in C Major K 314, Rondo Alla Turca K 331, Queen of the Night from Die Zauberflöte and Symphony No. 40.