John Cafferty & The Beaver Brown Band is the name of an American rock band from Narragansett, Rhode Island, that began their career in the 1970s and achieved mainstream success in the 1980s. Originally known as simply Beaver Brown, the group (consisting of John Cafferty on vocals and rhythm guitar, Gary Gramolini on lead guitar, Patrick Lupo on bass, Kenny Jo Silva on drums, Bobby Cotoia on piano, and Michael "Tunes" Antunes on saxophone) started out as a New England bar band and initially established a popular following throughout Rhode Island, Connecticut,and Massachusetts.
They achieved their greatest fame performing the music of a "Springsteen-esque" fictional band in the 1983 movie Eddie and the Cruisers. The soundtrack album from the film reached the top 10 on the Billboard 200 chart and produced a number 7 hit single ("On the Dark Side") on the Billboard Hot 100. "On the Dark Side" also held number-one on the Album Rock Tracks chart for five weeks.