#1
ok my question is, how do i pick a key or scale to play in for writing a song?? is it just random, or are there rules involved?
#3
usually they pick a key the singer could sing in, but if it is instrumental you could play in whatever key you'd like
#4
It's just what you feel comfortable with, about the only rule I know of is stay in a key that you (or whoever is singing) can sing well in
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