Original: Purrfect 4-String Bass Method. Purrfect 4-String Bass Method by Brian Emmel. Brian Emmel. Double Bass sheet music. For Bass.
Traducció: Purrfect 4-String Bass Mètode per Brian Emmel. Doble el full de música Bass. Per Bass. Sota. 56 pàgines. HL.201. ISBN 1574240366.