Black and white photograph of audience members lounging on blankets at the WCFL Big 10 Summer Music Festival in Chicago, Illinois on July 18, 1970, by Douglas R. Gilbert. Scanned from the negative.

Black and white photograph of audience members at the WCFL Big 10 Summer Music Festival in Chicago, Illinois on July 18, 1970, by Douglas R. Gilbert. In the foreground a group of five dance in a circle with joined hands, while many others lounge…

Black and white photograph of audience members at the WCFL Big 10 Summer Music Festival in Chicago, Illinois on July 18, 1970, by Douglas R. Gilbert. A man in an unbuttoned shirt and cut-off shorts is mid-air after being tossed up from a blanket held…

Black and white photograph of audience members at the WCFL Big 10 Summer Music Festival in Chicago, Illinois on July 18, 1970, by Douglas R. Gilbert. In the foreground, audience members raise their fists and a woman sits atop another's shoulders,…

Black and white photograph of audience members at the WCFL Big 10 Summer Music Festival in Chicago, Illinois on July 18, 1970, by Douglas R. Gilbert. In the foreground audience members lounge and stand in small groups in the grass at Soldier field…

Black and white photograph of the audience at the WCFL Big 10 Summer Music Festival in Chicago, Illinois on July 18, 1970, by Douglas R. Gilbert. In the foreground a large peace flag waves in the wind over people as they lounge in the grass at…

Black and white photograph of audience members at the WCFL Big 10 Summer Music Festival in Chicago, Illinois on July 18, 1970, by Douglas R. Gilbert. In the foreground a white man with glasses and white headband looks eager, while just behind him a…

Black and white photograph of audience members sitting in the grass of Soldier Field at the WCFL Big 10 Summer Music Festival in Chicago, Illinois on July 18, 1970, by Douglas R. Gilbert. Scanned from the negative.

Black and white photograph of the audience at the WCFL Big 10 Summer Music Festival in Chicago, Illinois on July 18, 1970. In the foreground a white woman in a tie-dyed shirt stands in front of a white man and woman embracing as others lounge in the…

Black and white photograph of Wayne Kramer of the band MC5 performing at the WCFL Big 10 Summer Music Festival in Chicago, Illinois on July 18, 1970, by Douglas R. Gilbert.