"Let's Get it Started", also known as "Let's Get Retarded", appears on the Black Eyed Peas 2003 album Elephunk. It is the fourth single from the album.
The song was included on the Barbershop 2: Back in Business and Harold and Kumar Go to White Castle soundtracks, as well as the soundtrack for the 2006 romantic comedy "It's a Boy/Girl Thing". The song was also STAR World's first SID. It gained popularity as the theme song for the 2004 NBA Playoffs on ABC and was performed live at the 2004 Democratic National Convention. It was also featured in the film White Chicks. It was used in UK advertisements for the game The Urbz: Sims in the City. This song was remixed for The Black Eyed Peas' fifth studio album The E.N.D. as "Let's Get Re-Started.
"Retarded" is considered a derogatory term for the mentally impaired, making the song unsuitable for play on some radio stations and at sports games. In 2004 the song's lyrics were edited and "Let's Get It Started" found its way onto radio airwaves, movie soundtracks, and video games.