They must have tried it out on themselves for Darwinian fun and profit. How could this not be adaptive. I'm not so sure. Virtuosity itself may be an adaptation. Mocking birds don't seem to attract robins, cardinals, and catbirds, just other mocking birds.
Music can restructure the ground, shape the field, provide the context.
Music makes the line drawn between organism-environment vibrate according to the laws of physics. Music is a manipulation at the contact boundary. If you're sending music or if you're receiving music total energy must be committed. You must not be distracted from the production of your tone or the intensity of your listening. So your selective deflection is relentless.