No problem
Hi,
Get your self a set of inear monitors from Ultimate Ear, and add a MP3 or Mini disc player and away you go.
As the in ear monitors are also ear plugs, you only have to have the mini disc set at 4. (Sony Mini Disc I use anyway)
All a piece of cake.
Of course you could go the whole hog and fit a Autocom, and have phone, GPS, walkie talkie and the Music, watch out on this forum it will cost you money, always some one with a good new idea.
Best of luck
Gary.