John Cafferty and the Beaver Brown Band are an American rock band formed in Rhode Island in the late 1970s. The band is led by singer-songwriter and guitarist John Cafferty and is known for their rock and roll sound that is influenced by classic rock and rhythm and blues. The band gained national attention in the 1980s when they contributed several songs to the soundtrack of the film "Eddie and the Cruisers," including the hit single "On the Dark Side." The song reached the top 10 on the Billboard Hot 100 chart in 1984 and helped propel the band to success. John Cafferty and the Beaver Brown Band have released several albums over the years, including "Tough All Over" (1985), "Roadhouse" (1991), and "Live at the Bottom Line" (2002). The band has continued to tour and perform, and their music has been featured in several films and television shows.