Dion split from the belmonts in the 60s. Did semi folk songs in the late 60s. Then did Christian music for a while. He never hit the heights like with the belmonts.
Interesting movie on the era in the Bronx is The Wonderers. A better movie of the era from Brooklyn is The Lords Of Flatbush.
Sylvester Stallone and Henry Winkler (Fonz archetype) as the title characters...1974 - Wikipedia says Richard Gere was cast, but Stallone and him had a spat, so the director cut Gere loose