It is not a comprehensive list of print materials, only the titles that include interactive floppy disks. At the beginning of each list is an technology overview of how MIDI files can be used by that category of user. A brief description for each category is listed below. This list includes popular titles from Warner Bros., as well as popular tunes cross referenced with the Alfred and Hal Leonard piano courses. Look particularly at the Tune 1000 titles.
Many titles also have karaoke-style lyrics embedded in each song file.
The best local source for these books and disks is your Roland Contemporary Keyboards dealer. The Charlie Horse Music Pizza is a new 40-episode series for children by Shari Lewis which premieres on PBS this January. Keyboard Ensemble Series, Spring 2001 Listen to a MIDI File, and download the sheet music for it.