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Your comment reminded me that whistle tips go woo [1]

That’s just for decoration.

anyone bothered by these early in the morning should already be up making breakfast

Not everyone works 9-5. Some people work odd hours so you can, for example, go to the hospital at 0200.

There’s another video kind of like this one that I saw once, but instead of an actually motorized bike they are riding on a conventional bicycle and playing a trumpet to make it sound like a motorcycle.

I can’t find the video now but I think it was filmed in Brazil and the guys on the bicycle we’re like teenagers or something.

Note that that's actually a trombone and not a trumpet, contrary to what the video title says.