First of all sorry for my english, I'm french canadian.

I have been trying to find the chords of the main riff a little demo of the Jamman for a couple of days now. So far, I know what he's playing at 0:22 and maybe the last chord of the main loop/riff (I think it's a A7).

Some help with the chords of the main riff would be appreciated.

Here's the youtube link : http://youtube.com/watch?v=Yb9qkJ_7jK8

Thanks !