There's an unwritten rule that most TV theme songs that become hits, also become Forgotten Oldies. That's especially true with today's tune. "Welcome Back" was the theme for the wildly popular Welcome Back Cotter. Performed by John Sebastian of Lovin' Spoonful fame, it roared to number one on both the Hot 100 and Easy Listening charts in May of 1976. It also hit #97 on the Country Chart. Another forgotten oldie that was a number one smash hit. So, does anyone remember the John Sebastian and Steve Martin concert at the old Mary Sawyer Auditorium in the fall of 1977...??