Personally, I'd love to hear music that's been deliberately tuned for alien atmospheres – slow, shuddering drones, or crystalline symphonies of accelerated acoustics. Even more, I'd love to read an acoustic analysis of different landscapes here on Earth: how far a scream propagates in the gardens of Versailles, for instance, or in the new Orange County Great Park. Or whether your voice sounds deeper in the deserts of Utah. Or whether you can unexpectedly overhear people talking far away, on some humid curve in the Parisian Seine.
It's the science of acoustic planetology.