Interesting opinions on this subject ...
Personally don't understand why anyone would want music out on the trail - far too much countryside stuff going on, I want to be a part of it.
I ride to work evryday and i find if i cycle with earphones then i can hear traffic as well
+1As with MTB riding, if u can actually get your earphones to stay on when riding down a hill with loads of rocks and jumps il be impressed
can you still get those 'sports' ones which have a wee clip thing round the back of your ear?