Here's one for you:
I remember my Dad setting up his Quad Hifi with a test record (quadraphonic ?).
One of the recordings was of a tube train coming into & leaving the station. Another was an aircraft passing overhead. Anyone know if theses are available online anywhere? I've done a search but can't find anything so far.
I used to love listening to those & it may have been been the thing that kicked off my obsession with sound. I've come over all nostalgic all of a sudden!
I'm sure one of the SO sages will know what I'm on about.