C major (no sharps or flats)Sharp Keys:G Major/E minor (1 sharp)D Major/B minor (2 sharps)A Major/F-sharp minor (3 sharps)E Major/C-sharp minor (4 sharps)B Major/G-sharp minor (5 sharps)F-sharp Major/D-sharp minor (6 sharps)C-sharp Major/A-sharp minor (7 sharps)Flat Keys:F Major/D minor (1 flat)B-flat Major/G minor (2 flats)E-flat Major/C minor (3 flats)A-flat Major/F minor (4 flats)D-flat Major/B-flat minor (5 flats)G-flat Major/E-flat minor (6 flats)C-flat Major/A-flat minor (7 flats)These are all the possible keys you can write in, enharmonic keys are italicised.
There are a total of fifteen keys in Western music. Keys come with two forms, sharp keys and flat keys and one comes with all naturals. The complete list of major keys are shown below: C major (or A minor) - no sharps/flats G major (E minor) - 1 sharp D major (B minor) - 2 sharps A major (F-sharp minor) - 3 sharps E major (C-sharp minor) - 4 sharps B major (G-sharp minor) - 5 sharps F-sharp major (D-sharp minor) - 6 sharps C-sharp major (A-sharp minor) - 7 sharps F major (D minor) - 1 flat B-flat major (G minor) - 2 flats E-flat major (C minor) - 3 flats A-flat major (F minor) - 4 flats D-flat major (B-flat minor) - 5 flats G-flat major (E-flat minor) - 6 flats C-flat major (A-flat minor) -7 flats There you go, those are all the different keys you can write in!
There are no flats in b-minor. B major has two flats, both B-flat and A-flat, but b-flat minor is the relative minor of D-major, which has a sharp key signature. The sharps in b-minor are F-sharp and C-sharp.
The key with 6 flats is G flat major (this is the same as the key with 6 sharps: F sharp major). The relative minor is e flat minor (also called d sharp minor).
A key signature is the placement of sharps or flats at the beginning of a piece of music which determines what the key of a song is and unlike the time signature it is repeated every line; here is a list of all the possible keys you can write in:C Major/a minor (no sharps and no flats)Sharp Keys:G Major/e minor (1 sharp)D Major/b minor (2 sharps)A Major/f♯minor (3 sharps)E Major/c♯minor (4 sharps)B Major/g♯ minor (5 sharps)F♯ Major/d♯ minor (6 sharps)C♯ Major/a♯ minor (7 sharps)Flat Keys:F Major/d minor (1 flat)Bb Major/g minor (2 flats)Eb Major/c minor (3 flats)Ab Major/f minor (4 flats)Db Major/bb minor (5 flats)Gb Major/eb minor (6 flats)Cb Major/ab minor (7 flats)
There are no flats in Em, just an F sharp!
There are no flats in D major, but there are 2 sharps. C sharp and F sharp.
E natural minor has one sharp on F. The key signature is the same as G major.
C major: no sharps, no flats F major: no sharps, B flat Bb (B flat) major: no sharps, B and E flat Eb major: no sharps; B, E, and A flat Ab major: no sharps; B, E, A, and D flat Db major: no sharps; B, E, A, D, and G flat Gb major/F# (F sharp) major: no sharps; B, E, A, D, G, and C flat / F, C, G, D, A, and E sharp; no flats B major: F, C, G, D, and A sharp; no flats E major: F, C, G, and D sharp; no flats A major: F, C, and G sharp; no flats D major: F and C sharp, no flats G major: F sharp, no flats
E minor contains one sharp: F.
The key of A minor contain's no sharps or flats and as such is related to the key of C major (all white notes on the piano for both). This relationship is why it's called the "relative minor" of C major.
The key of G-sharp minor has 5 sharps (it's the relative to B major). G-flat minor is a key that only exists in theory, because that key signature would contain 9 flats. The limit on flats or sharps in a key is 7.