[euphoria]

The algorithm for generating chords does seem to work very well for simple songs, and at least makes a good stab at more complicated songs, for the guitar-driven songs I tried.

In terms of presentation and editing, I believe the guys at http://www.soundslice.com/ have a solution that is much better. I would love to see a synthesis of these two technologies, with YouTab producing a first draft of a sheet for SoundSlice based on any video.