Bob's got it. It's a magnum opus and deals with all of the tunes designated for 17th century ballads and their histories. A must for anyone looking at tune histories. The texts can easily be consulted at the Santa Barbra website 'English Ballads. They quite likely have a search engine for the tunes as well, and indeed performances of some of them. Chappell is not the most reliable source, although I think he did a good job on the first volumes of the Roxburghe Ballads.