wen i wer a lad y sat down got the key and went from there. now unless ur a jazzer and its just a popular tune UTUBE fool. some1s probly bin there. still using ur ear is never a bad fing. get root notes, get chords, get fiddly bits. wana take it further get melody and play chords. find relavent scales, learn over 2 octives then solo y ass off.