A few notes.

The Google Books search engine is certainly useful. UK users are barred from seeing Wardroper's Love and Drollery, though. How many pages are available to you in the USA? The copyright is recent on that edition; presumably Google has an arrangement with the publisher. An Antidote Against Melancholy is witheld from UK users for no obvious reason, but exactly the same file is freely available at the Internet Archive.

Earlier in this thread (10 years ago) Bruce mentioned that 'The texts from Ravenscroft's books ... are on the SCA Minstrel website'. That is still the case. Facsimiles with music can be seen at http://www.pbm.com/~lindahl/ravenscroft/

The link there to Hilton's Catch That Catch Can no longer works. Unfortunately, the material appears to have been removed from the webserver at Acadia University. Fragments can be recovered via the Internet Archive, but I have had no success so far in locating copies of the image files themselves. Still, much of the content had earlier appeared in Ravenscroft's Deuteromelia.

'John Barleycorn is a Hero Bold' ('Hey John Barleycorn') was written by the Lancashire music hall performer Joseph B Geoghegan, but I didn't know that back in 2003 when Suzanne posted it.

The DT file 'Three Merry Men of Kent' credits no source (though the attached midi does: I provided that), but I expect it was copied from Chappell, which will have been where TOA got it. Two further verses are quoted in Dixon-Bell, Songs of the Peasantry ('The Merry Fellows') at the beginning and end of those in Chappell:

Now, since we're met, let's merry, merry be,
In spite of all our foes;
And he that will not merry be,
We'll pull him by the nose.

He that will not merry, merry be,
With his sweetheart by his side,
Let him be laid in the cold churchyard,
With a head-stone for his bride.

Available in various formats and in various locations online. 'Ours', noted the editors, 'is the ballad- printer's version.' An oral version from Alfred Williams' collection, little changed from the broadside text, is transcribed as 'Now we've met let's merry, merry be' at http://www.wiltshire.gov.uk/community/getfolk.php?id=899.