Just a quick note though. Am is the relative minor to Cmaj so this should work but if you change Cmaj to Cm, that would not fit the same.
The fact is, you can play any notes over any chords, you need to experiment. You will find that sometimes it sounds good and interesting other times the notes will clash and be harder to listen to.
In most cases, the relative minor can replace the major and still provide a nice backing to the same melody, it just changes the whole feel and character.
If it helps, here are the major chords with their relative minors:
Amaj - F#m
Bbmaj - Gm
Bmaj - Abm
Cmaj - Am
Dbmaj - Bbm
Dmaj - Bm
Ebmaj - Cm
Emaj - Dbm
Fmaj - Dm
F#maj - Ebm
Gmaj - Em.
There ya go... try swapping some of the major chords that you play with one of these relative minors and see how the mood changes.
Gordon.
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