There are whole movements of young people these days decking out their bikes with giant speakers and boom boxes. It's similar to the big car stereo boomers.
http://www.geekologie.com/2008/08/post_46.php
Just what we need....boom boxes blaring from bicycles everywhere.
I say to this trend- keep your music to yourself instead of forcing it on others who are enjoying their own rides, jogs, or walks.