Armin K"upper offers up some Pipelinefunk: "Saxophone jam using a pipeline as natural delay and reverb" When I was preparing for my recording session on the tube, I got a visitor here and gave a little spontaneous concert."

Here's Somewhere Over The Rainbow:

And here with a guitar:

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https://boingboing.net/2020/06/26/saxophone-played-into-an-empty.html