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"409" is a song written by Brian Wilson, Mike Love and Gary Usher for the American rock and roll band, The Beach Boys. The song features Mike Love singing lead vocals. It was originally released as the b-side of the "Surfin' Safari" single. It was later released on their 1962 album, Surfin' Safari, and it was also on their 1963 album, Little Deuce Coupe.
The "409" of the song is the Chevrolet 409.
The song was inspired by Gary Usher's obsession with hot rods.