LONDON, UNITED KINGDOM - JUNE 30: Jackie Greene of The Black Crowes performs at Hard Rock Calling Day 2 at Olympic Park on June 30, 2013 in London, England. (Photo by Chiaki Nozu/WireImage)
LONDON, UNITED KINGDOM - JUNE 30: Jackie Greene of The Black Crowes performs at Hard Rock Calling Day 2 at Olympic Park on June 30, 2013 in London, England. (Photo by Chiaki Nozu/WireImage)