[mtoohig]

That assumes there's no mixing involved to call it a recommendation engine. I just don't have time to know all songs from beginning to end by title alone anymore or to have a curated playlist ready for every occasion so it helps me find "recent songs I rated highly and downloaded within the last month" or find "a song with a vocal and in X,Y or Z key of a certain genre". I don't want to clash two vocal songs together by accident or I want to be aware of some other note I left on a song before I cue it so I can filter more easily.