November 12, 2004 at 05:00 AM EST

The video for this Run-DMC/Aerosmith collaboration collapsed the distance between rock and rap with a brutally simple image: Aerosmith’s Steven Tyler bashing through a wall with a mic stand. ”I think I ripped every muscle in my back,” he says. The video became a defining moment for both acts. ”’Walk This Way’ really brought three generations together,” says Darryl ”DMC” McDaniels. ”It brought the ’70s rockers, the ’80s hip-hop fans, and later the ’90s rap-rock generation. It was the connecting piece.”

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