I can't help but think of things like these in a future where there was some sort of gap or loss in human learning, maybe due to a mass-extinction event. It would be seen as a mysterious artifact from the ancients that has been singing forever. Religions and priests would arise to interpret every minor change or fluctuation in the notes since they are obviously a message from a being or being so eternal that they couldn't even slow their speech enough to address in one lifetime, let alone 20.