I would like to turn this into a positive link. When I learn a song I am not interested in the extended chords � such as G13-5, G7+5, G#11. I turn every chord into it simplest, example from G7#11 into G7. Cm11 into Cm. For one it helps me memorize a song quickly. My second reason is that many times the chords are not correct. Do I play the song with the simple chords? Never.
As a guitarist I always tried to tell a story with my chords. You could listen to my chords and leave the melody out and it would sound good � I was telling a story, a story that added to the singer or soloist. If I was backing a sax I knew his solo could reach new heights if I played a great chord line.
You do not add or extend chords for a song like Rock around the clock � or Fame � to do so would destroy what made it popular in the first place. Songs like Body and sound and Misty offer a lot of room for a player to express themselves.
My suggestion, if there are people who are interested, is to post one or two ideas on a particular song. In the past players posted a complete song with all the changes they made; overkill, too much to absorb at one time. Just one or two ideas. Those who enjoy sharing their knowledge as well as those who wish to learn will get something from the posts.
John C.