at 2:45 mark Nils Lofgren discusses the bands performance with Chuck Berry at the Rock and Roll Hall of Fame opening. I think the song in question was Rock and Roll Music? Chuck “deliberately” changes the key of the song about 5 or 6 times to mess with the band. Ultimately duck walking off the stage in the middle of the performance before getting in his car and driving off. Leaving the entire band in shambles all playing in different keys which Nils describes as hilarious and the worst performance of their careers. Does anyone know if a recording of this song exists somewhere?