I use Opera Unite and I must say, it is a very neat thing. The media player would be practical for the emu radio. The only requirement is that the DJ has to have opera open and unite on for it to work. The media player plays music in a playlist style, the only issue is you can see the whole playlist and play any song you want. Check it out
http://unite.opera.com/en_us/. Also, the part is it doesnt cost you one dime.
EDIT: Also, if you a certain playlist up, you can export it to a m3u file and play it on a a media player without the need for the browser to be open.
Regards,
Tow'lin Tow