In March 1970, London music venue The Roundhouse (a one-time railroad structure celebrating its 50th anniversary this year) held what they billed as “Seven Nights of Celebration” in a “Living Theatre Environment.”

The weeklong festival, “Atomic Sunrise,” was a collaboration between regular performers at the venue’s Sunday Implosion gigs and The Living Theatre, a radical experimental theatre company.

While the Living Theatre performers moved among the dancing and reveling audience, a succession of bands played onstage, including Genesis and David Bowie with one of his early bands, The Hype.

These never-before-seen photos capture the crowds immersing themselves in the sounds and sensations of a pivotal era in music.