"The Digital Tradition is a data base containing the words and music to thousands of folk songs. These songs have been collected over the last eleven years by Dick Greenhaus and friends. Originally distributed as a free PC DOS program with full text search and audio playback, the Digital Tradition is now also as plain ASCII text (e.g. for UNIX systems), and most recently via a World-Wide Web Internet server and in CD-ROM format. It has been—and hopefully will again be soon-- available for Macintosh computers; we're currently encountering incompatabilities between our MAC version and Apple's newer operating systems."

Up at the top there is a 'box' with the word GO to the right of it. Go to that box and click on the arrow head pointing down. A longish list of theings will come up. Fourth from the bottom is About the Digitrad. Click on that and Bob's yer uncle. It's explained there in Dick's own words, some of which are quoted above in this post.