Rhythmic Structures are a set of repeated rhythmic-gestures that work with other melodic phrases within a given composition.
Consider the following semi rhythmic etude:
Rhythmic Structure is created by Kick and Snare drums played with the Right and Left feet.
Melodic phrases are played on Roto Toms (Right hand).
Hi-hat and or cymbals (Left hand) can be added for additional accents or gestures that would aid Melodic phrases.
Rhythmic Structure Example: