Just couldn't resist embedding this performance from Antones annual Austin Blues Society fundraiser posted by Stephen Schneider on his htownfess youtube site. They're just not many blues singers who can nail down that Magic Sam vocal vibrato like Bobby Mack does here on Sam's "What I Have I Done Wrong".
I think that I've said this before, but if you don't have any Magic Sam, then get you some and then some Bobby Mack along the way. Anyway--
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