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?
usually they pick a key the singer could sing in, but if it is instrumental you could play in whatever key you'd like
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
Member 3 of the FINAL FANTASY VII club.

A recent study shows that 92% of all teenagers have moved on to rap music. Put this in your profile if you are one of the 8% who stayed with the real music