Oingo Boingo  was an American new wave band, best known for their hits "Dead Man's Party" and "Weird Science". They are noted for their high energy live concerts, movie soundtrack contributions, and their mixture of genre, which can be described as including ska, pop, rock, and world music. The band was founded in 1972 as The Mystic Knights of the Oingo Boingo, a performance art group. The band was led by songwriter/vocalist Danny Elfman, who has since achieved success as a composer for film and television.

With the move to MCA, the band made two personnel switches: Mike Bacich took over on keyboards from departing member Richard Gibbs, and John Avila replaced Kerry Hatch on bass. Oingo Boingo appeared in a number of soundtracks in the early to mid-1980s, including Fast Times at Ridgemont High, which features "Goodbye, Goodbye". Their song charting highest on Billboard Hot 100, "Weird Science", was written for the John Hughes film of the same name, and was later included on their 1985 album Dead Man's Party.  Later, the band made an appearance playing their hit "Dead Man's Party" on stage in the film Back to School. In addition, they appeared in and performed several songs in the quirky 1984 Tom Hanks movie Bachelor Party, including "Who Do You Want to Be?", "Bachelor Party" and "Something Isn't Right". Then, starting with 1985's Pee-wee's Big Adventure, Danny Elfman began scoring major films with increasing frequency, including almost all of Tim Burton's films.  Oingo Boingo's 1987 album BOI-NGO was released as a follow-up to the popular Dead Man's Party, but its chart performance was considered an underperformance. After this album, Bacich was replaced by new keyboardist Carl Graves. The band's 1988 release Boingo Alive was actually recorded live on a soundstage, with no studio audience; it consisted of a selection of songs from earlier albums, plus two new compositions. The Boingo Alive track "Winning Side" became a No. 14 hit on US Modern Rock radio stations.  In 1990 the band released their seventh studio album, titled Dark at the End of the Tunnel.

what switches did they make?
Mike Bacich took over on keyboards from departing member Richard Gibbs, and John Avila replaced Kerry Hatch on bass.