In watching the early SS clips, CM's voice sounded different. At first, I don't think it was Frank Oz who originally did his voice. Unless I'm wrong, it just sounded different to me. Did someone else do his voice before Frank? I know he did the voice of the Beautiful Day monster (Jim did the voice on the Ed Sullivan skit however!.)
Welcome to the Muppet Central Forum!
Christmas Music
Sesame Street debuts on Netflix
Back to the Rock Season 2
Sam and Friends Book
Jim Henson Idea Man
Bear arrives on Disney+