In 10.8 through 10.10, the fix for this was to hack the coreaudiod binary.
In 10.11, the system wouldn't run the new coreaudiod unless it was signed. Solution: sign it with your own key, because they accepted any signature.
Well, in 10.12, that doesn't work any more. Copy the executable and it works; re-sign it and it doesn't. Presumably they are checking for an Apple signature now.
Any ideas of another workaround?
I happen to like having my machine be secure even if it happens to be playing music. How weird.