Composer Charles Fox and lyricist Norman Gimbel were hired by Laverne & Shirley creator Garry Marshall to write the show's theme song.[3] While Fox was visiting Six Flags Magic Mountain theme park in California, Grecco caught his attention when she was singing in a pop group at the park. Fox shared the Laverne & Shirley song with Grecco and offered her the opportunity to audition.[3] Accompanied by The Ron Hicklin Singers, Grecco sang the hit theme song and it was released it as a single. The song spent two weeks at No. 25 on the Billboard Hot 100 in 1976.[1][2]