Piano Repertoire: Romantic & 20th Century - Preparatory Level by Keith Snell. For piano. Neil A. Kjos Piano Library, Collection. Keith Snell Series. SMP Level 1 (Elementary). Music book. Published by Neil A. Kjos Music Company (KJ. GP620). ISBN 084976209X. Representing composers and musical styles of the 19th and 20th centuries, these collections include student favorites and teacher selected classics, including works by Beyer, Kuhler, Gurlitt, Bartok, Grieg, Schubert, and many more. Prep.