If for some reason you are looking at this, this is where we have gone to.
sound_rationale is a music rating community. Certainly, we will tell you what we think, but we will also offer insight on other artists you might enjoy. We have approximately 80 accepted members, and even more rejections. It is very competitive. If you think you are up to the challenge, or have something to offer that one of our members does not, by all means, check us out.
We offer mp3 trading in something we call "The Game." The Game is when three people post a song (there are different rounds) and people vote whether it is awesome. If it is awesome (there is a difference between bad, good, great, and awesome) it will be put on to a mix we are composing, and whoever wants one at that time, gets one. Many people also just post mp3's. And that is just one of the perks.