Some of us had fun on the 'Bertsongs' thread a few months ago, identifying instances in which the great A. L. Lloyd had tinkered with - or in some cases altered drastically - various songs from traditional sources. What I'd like to know is: have we firm evidence of traditional (or 'source') singers doing the same kind of thing? Did Harry Cox use the broadsides he possessed to fill out texts learned aurally? Did Walter Pardon or Joseph Taylor improve the melodies of their songs? We might infer as much, but I'm looking for specifics.