I agree with the anti-music-while-bicycling contingent here. In my van the radio is always on but I would never listen to music while bicycling. My ears are a principal safety device, especially considering that I don't use a mirror. I want to hear what is coming up behind me. And, as I have said before, few things are more exasperating than screaming "On your left" at some jogger, bicyclist(s) or (worst of all) rollerblader and going unheard because they have music stuck in their ears.
I have never been bored while bicycling even on the longest, loneliest road. Even on my Holiday FL to Savannah GA - and reverse - ride which I have done numerous times (and isn't very scenic) I don't get bored.