There are quite a few: Can Merthyr - My wife did go to dinner, Cig moch a palfais wether; She did eat the cig, gave me the cawl - A dyna'i chi ddiawl o bartner.

'Ei Di'r Deryn Du: 'Ei di'r deryn du, To my dearest love? O cais fy nhgangen gu, For I'm so deep in love. (I like this one a lot - lovely tune, very sad.)

And some others. The publications of the Welsh Folk Song Society are your best bet, as they (all?) have explanatory historical notes in English and in Welsh. The above are in Canu'r Cymry Vol 1 (ISBN 0 90042658 6. There's also a second volume (can't remember if there are any macaronics in it). The Society has published quite a lot, so the sources *are* available. If you have any specific queries, let me know, and I'll get in touch with people who know these things!

You can order books from Dyfrig Thomas at www.preseli.com/siopywerin or through the Welsh Books Council (sorry, don't have the URL to hand)