A series of books published by Carl Fischer, pertaining to music theory, performance, and improvisation. There are several varieties of the Grimoire series, pertaining to keyboard, guitar, or bass. For the most part the books contain scales, chords, and phrase snippets for each scale.
Actually, if one can find them, they are an indespensible reference for AP Music Theory. The books contain information on intervals, modes, and inversions, all of which is drilled on in AP Music Theory (however, the books most schools use for the AP class are full of errors and are difficult to understand — the Benward & White books, mostly).
For aspiring musicians, the Keyboard Grimoire is quite possibly the best theory book on the market, helping with improvisation (not only in Jazz and Blues, either), and giving some inspiration for great melodies (scales, such as the Hungarian Minor scale, are rarely found in popular music, but are beautiful — and are less tiring than the common Major or Minor keys).
The website for this publisher is www.carlfischer.com.