It was written by Brian Wilson, Rick Henn (former leader of the Murry Wilson-spearheaded Sunrays) and veteran arranger/producer Don Ralke (who previously contributed to The Many Moods of Murry Wilson [1967]).
Brian Wilson, Rick Henn, and Don Ralke were responsible for writing this piece.  Henn was formerly the leader of the band led by Murry Wilson, while Ralke had previously worked on The Many Moods of Murry Wilson in 1967.