Perhaps a drum is a space wrapped in material. With some excitement the space and the material interact to produce vibrations, which we hear.
Separately, yPLO prepared some sounds in advance of a performance based on the components of a speculative drum kit. ob TRU was performed and recorded live on 6/8/18 at Cafe OTO. During this live performance yPLO used amplified mylar, floor tom bass drum, mixers, audio recordings and microphones. The recordings were mixed and edited into 8 discrete tracks.