This isn't directly about ABC, but I hope it's of interest: Over the years I've been developing an index that identifies tunes simply on the basis of whether they go up or down from one note to the next, called Torus (Tunes ORdered Using Shape). Originally hardcopy, it's now available online at http://www.thomasbending.co.uk/torus/ with a database of about 1100 tunes. Please try it out and tell me if it's useful and how it might be improved.
I'm aware that other people have developed similar systems independently. I'm not claiming that mine is bigger, faster or better than any other, since it probably isn't. Thomas Bending To subscribe/unsubscribe, point your browser to: http://www.tullochgorm.com/lists.html