Hello All I'd like to thank all the people who replied to my question. I've gleaned some of the recent history of the tune, and rediscovered a couple of websites I've not visited for a while.
Especial thanks to Ian Lawther, though, whose very specific reply has solved my problem - I'm really grateful, Richard To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
