If you’ve listened to any rap or pop music made in the 21st century, you’ve heard John Lehmkuhl’s most famous creation, a thwacking metallic percussion sample named “Tribe.”

“Grindin’,” a song performed by legendary Virginia Beach group the Clipse, was the national anthem in 2002. The song’s sparse beat—which would be recognizable even without any accompanying lyrics or melody—was created by the hit factory duo known as the Neptunes, made up of producers Chad Hugo and Pharrell Williams.

The reason the beat is so discernible is because of the sample at its center. The sound resembles a metal door, or maybe a locker, slamming. It’s a percussive wallop with a metallic tinge, like someone kicking an old aluminum trash can.