On this day in 1969, Led Zeppelin and The Who appeared on the same bill for the first and only time

The show, held at the Merriweather Post Pavilion in Maryland, was fairly early in both of the bands careers. However, The Who had been performing for longer and therefore took the headline spot, with Led Zeppelin as openers.

Zeppelin started the night off with a set including several blues standards and some songs from their newly released debut album. The band would also perform a new song, showing Whole Lotta Love for only the second time. The set would also run overtime, forcing a member of the crew to pull the plug to get them off stage.

In between the sets, the crowd grew increasingly rowdy, and according to some reports began smashing various parts of the stadium. Regardless, The Who took the stage and played a set featuring several of their hits, as well as most of their new rock opera Tommy. The band finished the set by smashing their instruments across the stage.

Both bands would soon be performing as headliners soon, meaning the two wouldn’t appear on the same bill again. The rare combination of two rock’s biggest acts even caused the price of memorabilia from the show to skyrocket, with an original poster selling for over $9000 in 2010.