I'd hate to be the only one not commenting. I agree with the early posts that most of my songs are three chords. When I get tired of doing the song I'll experiment by adding a chord or note or "something." I'm guessing that some writers of songs put in some of the wild, obsure chords just to make it hard to play. Not always the case however. There is an old story about a guitar player who auditioned for Hank Williams Sr. When Hank asked him to join the band the young man replied: "But I only know three chords, G, C. and D7th." and Hank said: "You mean there's something other than those?"

Z