Before they became popular, the group's members were will.i.am, apl.de.ap, Taboo and backing vocalist Kim Hill. She left the group in 2000 and was replaced in 2003 by Fergie. They first became popular with the single "Where Is the Love" and the album "Elephunk" and their next album, "Monkey Business" was also successful. They have more recently released "The E.N.D.", an album that has had the successful singles "Boom Boom Pow", "I Gotta Feeling" and "Meet Me Halfway".