i love hearing the sound of train whistles and trains speeding down tracks right before i go to sleep at night.

what's yours?

the sad, mournful cello

Cellos are wonderful.
I also love piano solos in otherwise relatively piano-free songs (see: Pink Moon by Nick Drake)

as for non-musical sounds, I really love the sound of cats purring, and the wind howling (and making the dry leaves on the trees rattle) is one part of the Winter I do love.

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Right now it's this:
YouTube - The Big Pink-Too young to love

\m/

i like stuff that hums and whirrs, so washing machines, fans. but my favourite is the sound of the weather - rain, wind - especially when drifting off to sleep