My experience with the Slacker search feature has been a disaster. It seems that it's totally set up to search for commercially popular music, which I almost never listen to. Forget classical music -- whoever programmed that part of the search engine appear to be completely ignorant. For example, if I do a search for a Beethoven string quartet I get a very long list of everything but, most of it total crap. So I won't be using Slacker.