Has there ever been a more musical modern President than this one? OK, sure, Ford invited Bowie over but that's because HIS SON WANTED TO MEET BOWIE. Jerry didn't care in the slightest.
Clinton? Baby boomer. You can't imagine him quoting Jay-Z. And while it is true that Clinton could actually blow the sa, he never had the cool of Obama. Obama is a hip hop president. Nixon, Reagan, Senior? Dubya was a lonesome cowboy who never got much further along than Toby Keith.
Anyway, President Obama followed up his Al Green performance (if you can call one line a performance) with this one, taking a line off Robert Johnson's classic blues. First he throws down "Baby don't you want to go," and then, after handing off to BB King, conitnues with "Sweet home Chicago". And yeah, that's Jagger who conned him into getting on stage.
All I'll add here is: four more years