Simon composed the score for the controversial Frank Perry film, "Last Summer" (1969), starring Barbara Hershey and Richard Thomas. He played keyboards on the album "Alone Together" (1970) by Dave Mason, including the haunting piano on the song "Sad and Deep As You". In the Eighties, he wrote two ballet scores for the choreographer Twyla Tharp and composed circus music for aerialist Philip Petit (after his solo walk between the World Trade Towers). He was the music supervisor for a Broadway venture called "Rock & Roll! The First 5,000 Years", modeled after "Beatlemania", and produced the original cast album of "The Best Little Whorehouse in Texas".