It's called self preservation Mike.
I don't play well, but know a little theory.
I collab with several composers who don't have a clue what chords they are playing.
Well didn't have a clue.
Come time for me to write a bed track, it was a nightmare.
They'd send me where their fingers were on either guitar or keyboard and i would nut it out.
Then I gave them this link and life it a lot easier.
Glad you found it a good one Mike.
Graham

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http://www.soundclick.com/bands/2/grahamhenderson_music.htm