Vance asked Davidson to describe his fictitious band and their music. Initially, Davidson said that the Cruisers sounded like Dion and the Belmonts, but when they meet Frank, they have elements of Jim Morrison and The Doors. However, Davidson did not want to lose sight of the fact that the Cruisers were essentially a Jersey bar band, and he thought of Bruce Springsteen and the E Street Band. The filmmaker told Vance to find him someone that could produce music that contained elements of these three bands. Davidson was getting close to rehearsals when Vance called him and said that he had found the band -- John Cafferty & The Beaver Brown Band from Providence, Rhode Island.
who did the singing in the movie eddie and the cruisers
John Cafferty & The Beaver Brown