This is the Montréal session tunebook, as of April 2017. It was downloaded from music.gordfisch.net and unpacked here for local use. You might want to visit their site to get the current version rather than using this copy.

I've been experimenting with tools to do useful things in directories full of .abc tune files: Session lister - Tune lister - Collection lister These are "works in progress" that I've included here to get ideas for making them more useful.