Funny. The good things are that it's short. So it didn't "bored" me it was only music... If it would have been 120 minutes with only music...
If I have to say something, well maybe the framing. You have a lot of "headroom" in the frame in some shots (the space above the head).
But the fact that he's deaf makes it "ok" to hear only music. Although I do like also to hear other sounds (traffic, wind, people walking...)
and the other guy, maybe it was better to hear him shouting ?
