“Our manager gave us each $1000 and put us on the plane, economy class. We later found out we had received $250,000 for the show: he kept it all.” The true story behind Black Sabbath’s biggest show ever

On April 6, 1974, Black Sabbath performed for 250,000 rock fans at the first California Jam festival. It was a gig that would live long in the memory for all involved, for reasons both good and bad (LouderSound)