Question: What was the theme song for Welcome Back, Carter?
Televisionary: Dunno. But the theme song for Welcome Back, Kotter was called, oddly enough, "Welcome Back." It was a number-one hit on the Billboard charts (and the second-best-selling single for the year) in 1976 for former Lovin' Spoonful founding member John Sebastian. Sebastian was also responsible for the show's title, which was called merely Kotter before he came up with his theme-song title, inspiring the producers to change theirs.