True music fans (I'm not a dj or musician) have this subgenre issue. I'm an avid electronic music fan from the early days of space music to current drum funk, drum and bass. Watching the genres evolve over time and discussing the divergence a favorite pass time of mine.
Have you checked out Musicbrainz? The catalog that community is building is, from what I've seen so far, the most robust publicly available database. The 3 largest known databases are still privately owned and not available publicly
