As a percussion student that is always stretched too thin on time, I'm always in search of a systematic approach to cover all of my bases on drums: rhythm, time, dynamics, sticking exercises, rudiments, four-way coordination, etc. Finding an efficient system has been the bane of my existence for years.
Benny Greb's alphabet system is a very comprehensive approach. He codifies 24 "letters" which represent all the rhythmic possibilities in music. What it shows is that in a majority of all music (rock, classical, jazz, world music, etc.), a lot of the same rhythmic material is used. Hundreds of years, encompassing millions of pieces, mainly rely on these 24 rhythms. He even challenges you to take a piece of music from classical repertoire, and point out the "letters" in that piece.
Back to the system. Like learning language, he starts with a basic understanding of the letters, and the sound they make. You start without drums, or sticks; you just clap the letters, providing a good mental workout. Then, at the snare drum, you practice rhythmic accuracy, dynamics, rudiments, and sticking exercises. Then, you move to the drum set, and apply the letters to a different limb, giving you a four-way coordination workout.
Beyond that, he talks about soloing in a more musical way, thinking of making sentences, and other materials.
Before this, I had barely heard of Benny Greb. According to another reviewer, his playing credits aren't very vast. I say, So what? And there is indeed something very "New Breed" about this approach. However, the New Breed didn't address several aspects of this DVD, like snare technique, or soloing ideas.
This system, and this DVD in general, amalgamate several methods from the past, and present them in a very gradual, comprehensive approach, that applies to beginning students, all the way through professional players. Plus, there's a printable PDF booklet of like 60 pages! Bonus, there's three german guys in lederhosen singing and playing accordion at various spots. The german guys don't help the system at all, but I find it humorous.