I'm a bit conflicted. On one hand; I'm in new York City. So a guy blasting a speaker on his bike wouldn't be out of place with other NYers making noises; frustrated drivers stuck in traffic honking or blasting their own music, utility companies ripping up the asphalt, etc. But on the other hand we also have paths that are free of car traffic and can be quite peaceful at times; early mornings/late nights, winter time, raining, etc. Perhaps a compromise would be for the music lovers to use one earbud. No other human or animals have to hear their music; but they'll still have a chance to hear "on yer left" or a "ding, ding".