The British magzine "Motor Cycle Weekly" described the Commando horn as "sounding like a bee under a bucket". ANYTHING would be better.
There was an interesting traffic court case in Lancashire when I still lived there. A young chap with a BSA Bantam had a badly corroded exhaust system. He also had an inoperative horn.
He got two tickets one for excessive noise and one for an inoperative horn. Because of the archaic language in the horn rule, he got off without penalty. The rule required an "audible warning of approach". His defense was that his faulty exhaust system made so much noise, nobody could possibly claim they hadn't heard him coming. A very wry, sarcastic judge dismissed both indictments.