Take a sneak peek at Justin Kreutzmann's footage of Bob, the Marin Symphony Orchestra, and a few special guests rehearsing "Let It Grow" for the big First Fusion performance on May 7.
Tickets to this one in a lifetime event are available through the Marin Center Box Office (11am-4pm PT, 415-499-6800), as well as through gdtstoo.com and Ticketmaster.