I’ve always wondered this, and it recently popped into my head again…
I often mess around and compose at the Piano, but generally my hands (unless I force them t be creative and get away from their norms) tend to fall in set patterns – chords and harmony wise. I particularly enjoy a quick C, Ab, Bb to start things off!
I had a little jam with my flatmate the other day and he went straight to E minor on his guitar, and I’ve realised since that when I hear him messing around he’s most likely in the key of E.
This leaves me with the question: Do we all have specific chords or progressions we gravitate to? Or perhaps deeper, do many of us who are musical have a natural musical mode we fall onto?