American - Multiple Bounce Roll, Triple Stroke Roll, and Crushed Ruff. Įxamples of Drum rudiments that are similar to, or precisely like, a concert closed roll include: The metered closed roll should not be confused with the open or measured roll, as described below. The benefit is that the roll sounds optimal and smooth at any tempo. The drawback to this approach is that the player must count the beats of the music independently to, and in complete disregard of, the speed of the roll and the corresponding arm motion. Unmetered rolls require the player to perform the best possible sounding roll they can, whether or not the arm movements correspond to the musical tempo. The benefit is that it makes all the rolls fit neatly into the music in time and is easier to count. The drawback of metered rolls is that the ideal rolling speed (for the player, the room, the sticks, and the instrument) may lie between exact subdivisions, depending on the tempo, and the sound quality may vary by tempo. Metered rolls require the players arms and wrists to play in time with the beat of the music and so a regular subdivision, such as 8th note triplets, 16th notes, or 16th note triplets must be chosen and maintained. One major point of differentiation between rolling techniques is between Metered and Unmetered rolls. There are many interpretations of concert rolls and while the variations result in a similar rolling sound, there are subtle audible differences. 
The loud first bounce occurring closer to the quiet 3rd bounce from the preceding hand give the illusion that the bounces have a more even volume. One way to mitigate the loss of sound is to overlap the 3rd bounce from one hand with the first bounce of the next in the manner of a Flam Tap, only much faster and smaller. This involves the arm, the wrist, and the fingers. Because a multiple bounce stroke on a drum head loses energy, and volume, with each successive bounce, it is necessary to use special tactics and techniques to mitigate the loss of sound and cause the repeated notes to sound even.
The aim of a closed roll is to reproduce the effect of a sustained note on an instrument which inherently produces a short, staccato sound.
The closed concert roll (orchestral roll, buzz roll, or press roll) is performed by creating 3 (or more) equal sounding bounces on each hand alternating right to left, repeatedly and quickly. For the English record, see Close Roll.Ī common snare drum roll is the closed roll.
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