Let's Get It On was released by Marvin Gaye in 1973 as the title track of his album of the same name, co-written with Ed Townsend. The song became one of the defining soul records of the decade, reaching number one in the United States and remaining a staple of radio, film soundtracks and wedding playlists. Online, its opening has become shorthand for instant attraction, so creators borrow the fifteen-second clip to signal romance in seconds without needing any dialogue or explanation.