Jim Henson's Muppets Present Rowlf's Very Own First Piano Book includes music for 11 original songs based on Muppet themes. The book is arranged for easy piano, and edited by Milton Okun. Each song is illustrated with a picture of Rowlf the Dog, drawn by Daryl Cagle. (Cagle's name is incorrectly spelled as "Kagle" on the book's cover).