Oh, no, Ebbie - I can't imagine deleting the threads. I think they should provide supplemental information and references and linbks that won't appear in the Digital Tradition. Take a look at what Malcolm and Alan Foster and Ed Pellow did with the Penguin Book of English Folksongs.
That brings up another question: when there is already a significant thread discussing a song, should we use that as the DTStudy thread?
-Joe Offer-