Hey, every time I look at the Bodleian Library site, I find new items of interest just by random search. For example, looking for The Arethusa led to a sheet which contained that and also Lambkin, a version of Long Lankin.
BTW Is there a project under way anwhere to transcribe these songs, or is it just as and when people find them? Should transcriptions be returned to the library for their use? What about copyright?