GGACP marks the recent 50th anniversary of ABC’s “Welcome Back Kotter” (September 9, 1975) with this ENCORE of an 2020 interview with Rock ‘n’ Roll Hall of Famer and The Lovin’ Spoonful founder (and singer-composer of the “Welcome Back, Kotter” theme song!) John Sebastian. In this episode, John entertains Gilbert and Frank with anecdotes about Cass Elliott, Jimi Hendrix, Keith Moon and Jim Morrison and reveals the stories and inspirations behind hits like “Daydream,” “Summer in the City,” and “Do You Believe in Magic?” Also, Groucho co-hosts “Music Scene,” Richard Pryor plays the Cafe Au Go Go, Art Garfunkel nails a Spoonful cover version and John remembers legendary bandmate Zal Yanovsky. PLUS: Vivian Vance! “What’s Up, Tiger Lily?” John plays Woodstock! Boris Karloff plays Captain Hook! And Ed Sullivan introduces the “American Beatles”!

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