Former Lovin' Spoonful frontman John Sebastian was given scripts for four shows, which was enough for him to identify with the show's underachieving students. After he wrote 'Welcome Back,' the producers named the show 'Welcome Back, Kotter' to fit the theme. DJs everywhere were swarmed with requests for the song, which soared to US No. 1 in 1976.


http://www.youtube.com/watch?v=9qy5LEeFHig&feature=player_embedded