High Quality Content by WIKIPEDIA articles! "3" is a song by American recording artist Britney Spears, from her second greatest hits compilation The Singles Collection. It was released on September 29, 2009, as the only single of the album by Jive Records. The song was produced by long-time collaborator Max Martin and Shellback, and recorded by Spears in July 2009 while touring Sweden. "3" is an uptempo electropop song that features a heavy bassline and synthesizers, and lyrics that talk about threesomes, while referencing American folk-singing trio Peter, Paul and Mary during the chorus as sexual slang.