The word 'Cartridge' in the title refers to the cartridge of phonographic pick-ups, into the aperture of which is fitted a needle. In Cartridge Music, the performer is instructed to insert all manner of unspecified small objects into the cartridge; prior performances have involved such items as pipe cleaners, matches, feathers, wires, etc. Furniture may be used as well, amplified via contact microphones. All sounds are to be amplified and are controlled by the performer(s).