Double Stroke Roll

The Double Stroke roll is basically just to strokes on each hand. When you play to strokes on each hand it is also called a diddle.To practice you should grab a pillow,start off slow and gradually build up speed, this is called a opened and closed roll(slow to fast).

                                                                   
                   

Rudiments

Drum rudiments are basic drum patterns, used as practice exercises. They are basically the foundation of drumming. You should practice these on a pillow to get them crisp and tight, Especially one such as the double stroke roll, single stroke, and all the paradiddles. A good book to buy to help you along the way of your rudiments is the Rudimental Cookbook by Edward freytag. Its packed with all the basic rudiments and comes with "a collection of 25 State of the art Rudimental Snare Drum Solos" and a performance Cd.

http://www.rowloff.com/BooksFolder/RC.html