People have posted a lot of nice clips from Chuck Berry's show at The Pageant a few days ago. There was a snippet of blues that I heard once but can't find now. Too bad-- it was pretty. I don't know if it's the on stage sound system there, or the family atmosphere with both kids and grandkids on stage, but the place seems to do him good.
Here's a snippet of Johnny B. Goode, minus lyrics.
Reelin' and Rockin'
Of course this bit from Blueberry Hill on March 16 also sounds pretty good.