Dan wrote:
It'd be about as annoying to other people as a car going by playing
music with the windows down and much less annoying than those cars
with
the bass pumped way up.

I don't have a car so why can't I annoy people with my bike? Hehe =p

The power requirements of loud, low frequency, sound are kind of
outside pedal power. The thing to do is use a PA speaker and listen to
a talk radio station, preferably one that has liberal leanings.