If you are talking about how to play when the key signature is different, then its simple to follow. A key signature is there only to avoid writing so many accidental (sharp/flat) notes. For example, in the key od
G major, the line for F is sharpened, so every F will need to be sharpened. This tutorial i found
http://www.teoria.com/reference/scales/05.htm (google is your friend)outlines some of the basics... I am assuming you understand some music theory here... if not, it may be worthwhile investing in a music theory book, or a teacher. They don`t bite!
