The harmonic minor is used simply for the i-iv-v-i progression
Cm - Fm - Gm (7)- Cm
The G minor chord is technically a part of the C minor scale. However, the chord does not give the feeling of returning back to the tonic (which is C minor). Now if you play this new progression, you can feel the return to the tonic
Cm - Fm - G(7)- Cm
This raises the 7th of the scale to B natural, thus making the V chord major, giving us a stronger sense of resolution than the Vm-Im progression does.
The melodic minor scale raises both the sixth and seventh degrees of the scale on the way up, creating a stronger pull to the tonic, but lowers them back on the way down, making the descending melody that of the Natural minor scale. This gives you the advantage of several alternate chords in the minor - a major IV and V chord (instead of minor ones) and a IIm chord (instead of a diminished). Using 4 part chords gives you even more alternate chords (ImMaj7, bVII Maj7, etc.) It also makes a smoother transition when modulating to the Tonic-Major key.
There are three varients of a minor scale: natural, harmonic and melodic.
The key signature of the C minor scale has three flats: B flat, E flat, and A flat.
two in natural minor, three in harmonic minor, and two in melodic minor going up and down.
all instruments have the same minor scale.... actually they all have the same scales whether they be minor, major, melodic... etc. scales are not instrument specific but rather mode specific. there are also three different types of minor scales.
Natural minor
In B harmonic Minor, you lower the third and sixth scale degree from the B major scale. So your notes will be B, C#, D, E, F#, G, A#, B There are three forms of minor: Harmonic, Melodic, and Natural.
C, D, and E are the first three notes of the C major scale.
Minor and major are two diatonic scales. A minor has no key signature. The key signature of A Major is three sharps, F# C# G#.
Mey Sovannara Principal chords are main chords built from each scale and they can be used and played in replacement of other chords that are built from a scale. There are three principal chords in each scale. In the major keys, the three are tonic major chord, Subdominant major chord and dominant seventh chords. In the minor keys, the three are tonic minor chord, Subdominant minor chord and dominant seventh chords. To avoid using too many chords and chords that are not pleasant to your ears, you can use these three principal chords to replace other chords in a scale.
Minor scales are a little weird, because they actually come in three flavors: natural minor, melodic minor, and harmonic minor. Melodic minor is particularly weird because the notes are different if you're going up the scale than if you're going down the scale! In all cases, the first five notes are the same, it's only the last two where things get weird. For the natural minor, the notes of G minor are: G-A-Bb-C-D-Eb-F-G. For melodic minor, if you're going up the scale, it's: G-A-Bb-C-D-E-F#-G, but going down the scale, it's the same as natural minor. Harmonic minor is probably the least used, and I don't remember the exact rules. I think it might be G-A-Bb-C-D-Eb-F#-G. The key signature for a minor key, though, will be that of the natural minor. So G minor will have two flats.
There is not three notes in any scale or key, if you are asking about the accidentals, there is one flat (Bb) in the key signature plus an additional C sharp for the harmonic minor scale.
They were commissioned by different people.