The world’s most famous music festival turns the big five-oh this year, and Hollywood’s Mr Musichead Gallery celebrates with Woodstock 50th Anniversary, a group show of more than 50 prints by Woodstock photographers Jason Laure, Baron Wolman and Barry Z. Levine.

Collectively, their images illustrate the music and muddy mess of those “Three Days of Peace & Music” in August 1969, especially the more than 400,000 people who attended; Max Yasgur’s farm in Bethel, N.Y., where the concert took place; lots of naked hippies bathing in a lake; and, of course, the 32 acts that performed, namely Jimi Hendrix, Janis Joplin, The Who, Sly and the Family Stone, Jefferson Airplane, Joan Baez, Joe Cocker, Crosby, Stills, Nash & Young, and Santana. (Wolman, Rolling Stone’s first chief photographer, photographed the legendary band right on the stage.)

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Jerry Garcia (Barry Z. Levine)

The exhibit’s free opening reception includes lives music and a discussion with the three photographers, moderated by gallery owner Sam Milgrom, who’ll reflect on being at one of the most historic moments in American rock & roll.

Mr. Musichead Gallery, 7420 W. Sunset Blvd., Hollywood.; Thu., Aug. 8, 7-10 p.m.; through Aug. 24; free. (323) 876-0042, mrmusichead.com.

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Woodstock Festival 1969. Sly and the Family Stone performing at the Woodstock Festival in Bethel, New York. (Jason Laure)

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