Hey all, my roomie is in a band and wants me to write something for a song they have, and im not sure where to began, i can play by ear and i know which key is what between the middle c and octave after meanin i know what tone u pressing without seeing ive picked up the melody line but thats a bout it, im not sure on how to go about finding what key it is in or any of harmonyzing stuff, im not a complete moron with the language of music, there just some many combinations to go from, how can i narrow the playing feild down?