So, one of the things we've been working on is confirming the speed of sound on Mars. Due to the thinner atmosphere, sound moves more slowly there...about 240 meters per second as opposed to 343 meters per second on Earth.
But the speed of sound isn't exactly the same across the entire bandwidth. On Earth this doesn't matter.
On Mars, it does. On Mars the speed of sound changes right in the middle of the bandwidth we can hear.
Which means if you were outside on Mars, which you probably won't be because unbreathable atmosphere and all, you would hear the high notes of a piece of music noticeably before the lower ones.
One could base an entire SF plot around this, although I don't quite have one yet.
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