Implement styles and moods tagging from Allmusic.com
The genre tagging from Allmusic.com is already implemented. Moods and styles would be an awesome addition.
A clarification: the genres that are suggested/filled in by bliss do not come from AllMusic. They come from MusicBrainz and (hopefully soon) possibly Discogs and Wikipedia too.
Mood and style could certainly be populated from AllMusic, but it would require a relationship being built between bliss and AllMusic - their data is not freely available.