Not sure about others here, but on the rare occasion, one cycles about..and hears someone practicing on their instrument.

Yesterday morning when descending a nice long hill, I could hear bagpipe music playing on a beach below the cliff. Doubtful that there would an event on a Monday morning in an semi-isolated area.

Other times, I've cycled in light industrial areas where one hears a band or drum practicing in a warehouse or empty office area somewhere. The latter stuff usually happens in early evening or so.