text: At the treble clef, take the last sharp on the right, call it "7" and count down the spaces and lines until you get to "1".  "1" is "Do."  If "Do" for example, falls on "F" , then it's in the key of "F"  If there's a sharp on that line, it's in the key of F sharp.\n\nSame way, take the last flat on the right, call it "4" and count down to "1".  That's "Do."\n\nAs for minors and majors . . . sheesh, take a music class or something.