Taking a look at the sheet music below, you can see how this drum rudiment is just a variation on the single stroke roll. Instead of having a consecutive stream (roll) of alternating single strokes, the single stroke four has four consecutive alternating single strokes played as triplets - hence its name. It should be counted, 1 trip let 2 3 trip let 4. Practice the single stroke four leading with both hands. Strive for consistent sounding strokes.
