Percussion Ensemble Percussion Ensemble - Digital Download SKU: AX.00-PC-0017074_SB String Bass. Composed by Leroy Anderson. Arranged by Justin Koszarek. Instructional. Part. 2 pages. Alfred Music - Digital Sheet Music #00-PC-0017074_SB. Published by Alfred Music - Digital Sheet Music (AX.00-PC-0017074_SB). ISBN 9781470626921. UPC: 038081506401.The Typewriter is a classic Leroy Anderson novelty piece. This medium-grade percussion ensemble is written for 9--10 players, and includes the classic typewriter rhythm (What's a typewriter?). Make sure to have fun and add a little bit of Jerry Lewis.