Ray Hildebrand recorded and performed as "Paul" of Paul & Paula. Certainly not a rocker, he composed and sang male lead on "Hey Paula", No. 1 in 1963.
https://www.nytimes.com/2023/08/30/arts/music/ray-hildebrand-dead.html
https://www.nytimes.com/2023/08/30/arts/music/ray-hildebrand-dead.html