 Dr. Penhorwood is the composer of many choral and vocal compositions.Penhorwood's songs have been broadcast by NPR, the Paris and Berlin radio networks and have been featured at Glimmerglass Opera, The Chautauqua Opera, the National NATS Convention, and Marilyn Horne's 70th Birthday Celebration.In 1999, the Indianapolis Symphonic Chorus, through the Lilly Foundation, presented Penhorwood with a commission for a choral work, "The Christmas Story".