<P> `` Let 's Get It Started '' is a song by American group The Black Eyed Peas , released as a single on June 22 , 2004 . The track was the fourth single released from the band 's 2003 album Elephunk and is a re-worked version of the album 's third track `` Let 's Get Retarded '' . This version was included as a bonus track on the 2004 re-issue of the album . </P>
who sings the song let 's get it started in here
American group The Black Eyed Peas