The 15 Stroke Roll is one of the most popular drum rudiments. Watch a video by D Mark Agostinelli, the author of the best seller, “The Drum Rudiment Bible” on how to properly play the Single Paradiddle Drum Rudiment.
If you are interested in learning about rudiments; then check out this book. It is the largest collection of drum rudiments inside of a single book. It has the basic 40 rudiments; plus an additional 460 “Hybrid” rudiments, which are typically overlooked. Some are easy and others are extremely hard to play. Even D. Mark Agostinelli himself has difficulty playing some of the extremely advanced rudiments.
The Drum Rudiment Bible: 500 Rudiments Beginner to Advanced; Check out “The Drum Rudiment Bible” on Amazon