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Bloom
Concert Poster (BG-133) advertising a series of four different concert events at the Fillmore West in San Francisco during August 1968. The poster is a renowned collaboration between two prominent psychedelic artists, Rick Griffin and Alton Kelley, and is titled "Bloom".
Concert Details
The poster promotes performances across two mid-week and two weekend slots in August 1968:

August 13-15 (Tues, Wed, Thurs): The Who, James Cotton, Magic Sam
August 16-18 (Fri, Sat, Sun): Creedence Clearwater Revival, It's a Beautiful Day, Albert Collins
August 20-22 (Tues, Wed, Thurs): Grateful Dead, Kaleidoscope, Albert Collins
August 23-25 (Fri, Sat, Sun): Quicksilver Messenger Service, Spooky Tooth, Cold Blood

Design and Collectibility

Artwork: The poster is famous for its intricate, triptych design featuring psychedelic imagery, including a mushroom cloud, skulls, disembodied hands, an Aztec serpent, and the central "Herald from Hell" figure.
Significance: It is a highly collectible piece from the Bill Graham Presents series, bearing the catalog designation BG-133.
Bloom