Does anyone know where I can get the sheet music for John Renbourn's arrangement of the Wexford Carol on his Traveller's Prayer album? He sings it with The Voice Squad and Maighréad Ní Dhomhnaill.

Listen here: http://music.walmart.com/m/000/16/35/17/81/82/0001635178182.01.01.003.mp3

Words here: thread.cfm?threadid=11332#83617

I want to sing it with my daughter and her best friend, but it's all about the harmonies and I can't pick them out. Has anybody worked it out? Or know where I can buy it? I've been all over the web without success. All of Renbourn's sheet music seems to be for guitar (which makes sense).

Many thanks,
Steve