The folks at SongCritic are trying something interesting. Artists can pay $5 to post a song, and have it reviewed by a few hundred of their regular readers. The $5 is more than fair to cover their operating overhead (streaming is still pretty pricey for the average person), and even if you're not getting feedback on the level of a TAXI, if you find one new fan who's willing to buy a CD or a concert ticket, your investment pays off.