FolkTuneFinder.com started as a university project and kind of went from there. It's a search engine for finding tunes from the hundreds of thousands of tunes that people from across the world transcribe in the ABC format and post to the web. Visit Folk Tune Finder to find out more.
Applicability of Textual and Musical IR techniques, the most interesting 9.5% of my dissertation. Some maths removed.
My bibliography, for people travelling the same path.