This is so badass. I was stalking my buddy Roger's (hi, Roger!) Instagram for this. The Voodoo Threauxdown Festival happened at Greek Theatre in L.A. over the weekend and a great jazz act called Trombone Shorty brought out a special guest: of course it was Dave Grohl.
Dave jumped onto the drums to help with this cool ass rendition of "In Bloom."
PS-Trombone Shorty is legit jazz. Give 'em a listen!