Watch Online Free HD Solarmovies. Pop sensations the Lovin' Spoonful perform their biggest hits in this collection of television appearances from the 1960s and '70s. Lead singer and songwriter John Sebastian discusses the band, their music and their legacy. Songs include "Summer in the City," "She's Still a Mystery," "Nashville Cats," the hit theme to the sitcom "Welcome Back, Kotter," "Did You Ever Have to Make Up Your Mind?" and "Do You Believe in Magic?"