We must develop ways to ensure that musicians receive their proper royalties for downloaded music. The technology already exists for companies to track the websites that consumers visit and create detailed profiles for niche-marketing schemes. The cost of making a CD is a major obstacle for most musicians. It would be much cheaper to rent server space from a web music service and publicize the work by web and email. This would foster innovation, because the most interesting musicians are often the ones who will never get a major record contract.
Musicians have a lot to gain from the web, but only if it's their choice how it's used.
Free trading services take away that element of choice. Because of that, no matter how you spin it, such websites are unethical.