some things to think about:
1) the unreleased trade is an elitist business. if you don't have something cool to offer, don't expect generousity. you will probably have more luck using audiogalaxy!
2) for most people that AREN'T djs or heavily into the business the music just has to be GOOD - whether the music is NEW or OLD... it only has to be good not so many people will know what is released and unreleased... hell, if you want to suprise people with something interesting that they may not have heard then just dig deep and find an old classic that suits the style you want...
3) mp3s on a big system sound like @!#$.