Non-natural sounds that are pleasing - what are yours?

I woke at 4am and have been listening to my dishwasher and washing machine. Seriously! They are both new and emit comforting 'rolling' sounds - not overloud, very regular and a bit like heartbeats. I can imagine these sounds as ones you would experience in the womb. At the end of the programmes there is a little twinkle of music - a final flourish that says with confidence, 'that's it for today!' Apart from natural sounds, do you have any favourites? Can overheard droning conversation occasionally be a pleasure to hear [not the words, the rhythm]? Have you ever stood in the street late at night listening to the hum given out by telegraph poles and street lamps. Or am I genuinely weird Nerd? {warning - do not do this if there are police about, in case they misinterpret your intent Flushed]. Somehow, I feel I'm not alone in this secret pleasure Relieved.

Parents
  • The only one I can think of is traffic. I don't like loud engine noises, horns or emergency services vehicle sirens, but the swish of tyres on tarmac sounds a bit like the sea. 

    I wish that all vehicles were electric already, and I'd really like the sirens turned down a bit on emergency vehicles - do they really have to be so screamingly loud?

    Edit: just thought of another one - fans, I find their noise soothing.

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  • The only one I can think of is traffic. I don't like loud engine noises, horns or emergency services vehicle sirens, but the swish of tyres on tarmac sounds a bit like the sea. 

    I wish that all vehicles were electric already, and I'd really like the sirens turned down a bit on emergency vehicles - do they really have to be so screamingly loud?

    Edit: just thought of another one - fans, I find their noise soothing.

Children