Christopher Butler 
Mastering Sight-Reading for Keyboard Percussion [PDF ebook] 

Mastering Sight-Reading for Keyboard Percussion is designed for any performance level. The exercises included can be utilized in a multitude of different methods to allow beginners to succeed and also challenging professional musicians. While the incorporation of rhythm into each exercise is recommended, this method is focused primarily on sight-reading pitch. These are great exercises to incorporate as part of a daily warm-up routine.