Liz, it's not a band. It's a collection of folk songs. I suppose you could say it is similar to the dt but its focus is narrower in that it only contains traditional (ie no modern singer songwriter) songs from documented sources.
I can understand the error George Seto got but that was fixed last night and I have since tried downloading and opening the zip files on a variety of browsers and zip extractors on Linux and Windows without problem.
What error messages do you get and where do you get them? Is it a problem with downloading, opening the archive or with the abc itself? Details of the program you use where the errors occur would also be useful.