For one reason or another the American Public Broadcasting Service (PBS) puts concerts on at The White House. The other day they did one which focused on The Blues and featured B B King, Derek Trucks, Jeff Beck and many more. Jeff very kindly played some guitar for some old fart who was trying his best to emulate Howlin' Wolf, after t'ole fart had approximated a cover of 'I Can't Turn You Loose'.
(Whizz forward to 4 minutes to get to Jeff Beck.)
During the subsequent finale when all the blues chappies were jammin' their way out, President Obama was persuaded to sing a verse of 'Sweet Home Chicago'; not bad, considering.