Sergei Tcherepnin created a work for a single listener that involves a sort of sonic massage.
from the New York Times
“the main attraction — which was booked in 15-minute private appointments — was the “massage,” performed in a back room behind makeshift curtains. It took a few minutes for me to experience the sensations in my body as music; the initial effect was not unlike that created by a mouthful of dentist’s drills. But after a while distinct pitches formed throughout my body, organized themselves into patterns and formed relationships with one another.”