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For anyone curious how to produce something that sounds like this, paulstretch is the way to do it. https://sonosaurus.com/paulxstretch/
My personal favorite use of this: https://youtu.be/XiKWfcy-Z70?si=iJTP0XTEAAObI_rU
https://pitchfork.com/reviews/albums/brian-eno-ambient-1-mus...
There's a basic playback speed control now (basic in as much as it doesn't preserve pitch) plus things like reverb and delay effects
Here's some slowed-down ambient music: https://test.ambiph.one/?m=1-Slow+Realisation-ap50a25c60
And a cat purring at 50% speed makes a pretty convincing lion: https://test.ambiph.one/?m=1-Lion's+Den-aa8a34c60e37f100ac50...
(Audio may be a little glitchy on Android Chrome if you have lots of sounds playing - I'm debugging that at the moment)