The tunes are all in .abc files in the directories with the lower-case "tune-type" names, which you see yere in the "Class" column. The file names have initial articles stripped off, and '_' is used instead of spacers. There are some duplicate titles, so a book+tune number is added of the form VVNNN, where VV is the volume name (00-15, where 00 means "unknown"), and NNN is the 3-digit tune number inside the booklet. This may be altered a bit eventually. A few of the names have a single-digit number added, when there are more than one version of the tune in the collection. And there are lots of missing tunes ...