Um, you are seriously caught in the grip of an unrealistic and misguided quest for perfect accuracy if you think the expansion of the universe and space time curvature could possible be relevant to to the musical performance of objects of such middle size and duration as turntables. Why not just site the second law of thermodynamics and give up right there? Why not pick at the electronics, where there are transfers of energy approaching light speed, where everything gets all weird.
Honestly, people.
Honestly, people.