Something something sine waves?
I think even if you’ve never hear it it would still be aurally pleasing, there’s something about the sound thats very full and sort of like kneads on your brain like a cat without claws (not that I endorse that, just comparing from experience)
I’ve never tried this! That sounds like pure vibes.
I’d imagine nostalgia is a big factor.
But otherwise, low-pass-filtered stuff generally sounds less exciting. You can read about pink noise and Brownian noise, for example, which more closely resemble natural phenomena like wind or rain from inside a shelter. Pink noise is white noise which decreases 3dB in volume each octave; Brownian noise, -6dB/oct. It were as if you put such a low-pass filter on white noise. So music that shares a similar frequency profile is relaxing.
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