It's interesting - I do this (songwriting, and production of) because it's fulfilling.
And when I don't, for any length of time (2-3 days, week), something seems missing.
The moment I pick up the guitar or sit at the piano, I am either writing something brand new, almost by itself...although sometimes it is just playing something I've already written of course.
And, then the 'post writing' part always happens ... I'm doing something else, but singing parts of the song I just wrote in my head...many times without realizing it or intending to...and 'filling in the blanks', automatically. Gee, ... I wonder to myself, did I just extend that verse with a pre-chorus?...that thing's GOT to go back on to tape (hard drive).
So i play and record because it is a part of me, and somehow keeps me whole.
I always think...it's not a hobby ... it's a need, a release, a requirement and something good for me. and, sharing it with others comprises some of the most special moments of shared joy, interest, connection and fulfillment I've had.