This is awesome ! I tried my hand at some chord recognition a few days ago : https://github.com/jcaille/Chords. I only compare chords to fingerprints I recorded, and do not extract pitch or anything. I'm looking for feedback or pointers on how to go further (mainly, discarding the fingerprints altogether)

Have you considered teaching chords and such ? Another cool feature would be to let people enter their own songs, or connect with a tab API to expand the library.