A
roll in general
percussion terms is usually described as a double stroke roll in duple meter, ie:
RR LL RR LL | RR LL RR LL ||
| ||
1 & 2 & | 1 & 2 & ||
These would be evenly spaced out at a 16th note pace, or in larger time denominations, 32nd or
8th notes, depending.
A
single stroke roll is the version of the double stroke roll played with alternating strokes.
A
split roll is when a roll is split into
single strokes between two people, usually the top two members of a
bass drum line playing the highest pitched drums:
Tempo = quarter note = 150
2/4 time
(sixlets) (sixlets in 2s) (split rolls)
ooo ooo |oo oo oo | o o o o o o o o ||
--------------|---------------|-------------------||
ooo ooo | oo oo oo| o o o o o o o o||
|__6__| |__6__||__6__| |__6__| |___8___| |___8___|
1 & 2 & ||1 & 2 & ||1 & 2 &||