Who sang the theme song to the only 1970s TV sit-com to have its theme song reach the top of the Billboard Hot 100 list?
- John Sebastian
"Welcome Back, Kotter" was a comedy based on the life and stand-up routine of U.S. comic Gabe Kaplan. It chronicled a teacher, Mr. Kotter, and his adventures with James Buchanan High's group of misfits, the Sweathogs. John Sebastian wrote and performed the theme song, appropriately titled "Welcome Back," which topped the Billboard charts in 1976. Sebastian is best known for co-founding the band The Loving Spoonful. Source: TVGuide.com
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