Piano Theory : Paperback : Hal Leonard Corporation : 9780793576890 : 079357689X : 01 Dec 1997 : (Educational Piano Library). Hal Leonard Student Piano Library mascots Spike, Party Cat and friends guide students through fun and creative assignments that introduce the language of music and its symbols for sound, silence and rhythm. Ear training and basic theory exercises help students learn to write and play the music they are learning, as well as music they create themselves. Now updated to correlate with the newly revised Piano Lessons Book 3...