19. The method of claim 1 , further comprising weighting the learned microgenre preferences of the user according to at least one of a measure of recency of selection of the content item having the analyzed microgenre metadata, number of selections of the content item having the analyzed microgenre metadata, and time of use of the content item having the analyzed microgenre metadata, wherein the act of selecting and ordering the collection of content items is further based on the weighted learned microgenre preferences so that content items containing microgenre metadata comparable to the learned microgenre preferences having relatively higher weights are ranked relatively more highly.
22. The method of claim 19 , wherein the weights of the learned microgenre preferences are decayed based upon the number of user selections occurring after the act of learning the microgenre preferences of the user.