Software to allow people to listen to music I play over Internet

[any ANONYMOUS forum user]

Any software or online service that allows a group of people to listen to your personal music files?

I'm taking part in a D&D group, and want to spice it up with some fitting, epic music, but since we all play via Skype we aren't able to listen to the same music (without someone trying to play music really loud through their speakers).

I was wondering if there's any software or online service out there that is free to download and/or use, and will allow me to add music from my own personal music library, that will allow others to listen to the same music in real time?