A Rhythmic Vocabulary - A Musician\'s Guide to Understanding and Improvising with Rhythm by Alan Dworsky and Betsy Sansby.
This 208-page book and CD is the first systematic, comprehensive approach to learning about rhythm. It's for any drummer, Djembe or otherwise.
Also good for other musicians playing any style of music. It organizes and analyzes hundreds of African and Afro-Cuban patterns to give you a deeper understanding of rhythmic structure. It also teaches rhythmic concepts and variation techniques you can use to create patterns of your own.
Learn to groove and solo with greater rhythmic freedom and express yourself with a richer rhythmic vocabulary. The book comes with a Timelines CD for you to play along with while you practice.