There is also (assuming we're not talking about the same thing)  A "Working" KWIC Concordance to Francis James Child's The English and Scottish Popular Ballads (1882-1898)  by Cathy Lynn Preston, University of Colorado.  I've only so far tried one of the (large) zipped files available, and once unzipped they have to be given a .ps or .eps extension so that programs such as Photoshop can read them (text editors would be a serious nightmare, as they display all the associated code!); however these do seem to be, well, concordances rather than straight transcriptions.  Maybe later files will prove to contain the actual texts rather than a comparative list of words and phrases, though given the source I rather doubt it.  Something, perhaps, to explore at leisure...

Malcolm