Featuring Joy Division, Leikeli47, Ritchie Valens and many others. Cheq out this footage of Black Sabbath performing "Children of the Grave" at the California Jam in 1974. The festival took place at the Ontario Speedway and at the time was the most successful event of it's kind, attracting between 300 to 400,000 paying punters. The bill also included rock behemoths Deep Purple and Emerson, Lake and Palmer. Sabbath put in a super heavy performance beneath the incongruous rainbow and palm trees backdrop. Ozzy is clearly having a great time, hyping up the massive audience and throwing his fringed jacket into the ecstatic crowd.