The sound of Muic

The Hitchhiker's Guide to the Galaxy has this to say on the planet Muic.

Avoid.

Even though it's beauty is renowned throughout the galaxy, the price you pay is, in this editor's opinion, far too great, for the composition of its atmosphere is unique.

There's no sound. None. What many consider to be air, though breathable, is absolutely resistant to any form of vibration, the upshot of which is, every living thing on the planet has evolved without a mechanism to process such information.

The people, though friendly, suffer this inconvenience in silence, as everything is silent, but for a visitor, the experience can be harrowing. The mutagenic field that envelopes the planet has the unforunate effect of causing any visitors to adapt to this peculiarity and many have reported that awaking one morning to find your eats have droppped off is not something to be repeated.

The planet Muic is the only advanced civilisation in the universe not to have suffered the apocalypse that is a Disaster Area rock concert.