I've always wondered about this. Is there a doctor in the house who could clarify the value of having this kind of
lagging indicator?
Presumably, the idea of having the musician playing is to give the doctor a heads-up in case they slice into a valuable area of the brain. But, by the time the music playing is affected, the slice would have already happened — so then, what's the point?
I agree it's a great way to harvest social media likes (which presumably helps pay the medical bills, so I suppose it's nothing to sneeze at). But it's tough to see how it'd meaningfully help a fine-grained surgery. That abstract on PubMed ^ seems to say much the same:
> ...playing music did not improve or modify surgery.