If your stuff is good people will re-share it, so tell us more about your music, like what type it is, any stories it tells etc...
In other words, with all the crap that is thrown in front of people now days, why should I spend my time or even concentrate long enough to type in your keywords hoping to get this song?
Think about it from our point of view.

if you have to tell everyone it exists and you are the only node that has it, you are doomed.
So mp3.com or other central places are a good thing to use.