The concert we went to see was the Medieval Baebes. I love medieval music and they do a beautiful job on reintepreting whilst keeping the original elements. Many of the songs they performed were probably known to Richard himself, maybe, in particular, the Corpus Christi Carol...since Richard and Anne were members of the Corpus Christi Guild in York.. I must admit during the performance I kept looking off toward the darkened area where Richard's tomb is (they had it roped off during the show.) At one point there was a bit of trouble with the sound and the girls had to momentarily go off stage--a sign from the King,lol?
The cathedral was nicely decorated with Christmas greenery including a tree and REAL candles were attached to the pillars. Although it is at its core a medieval church, St Martin's was heavily restored by those pesky Victorians, although in their favour at least they did put a splendid Green Man on one of the pillars. Interestingly, small fragments of the ruins of Greyfriars, where Richard was originally buried, were incorporated into the church at some period--in the roof, I believe. It is also said to stand on the site of a Roman Temple (this area was in heavy usage in the Roman period and the Jewry wall is close by, the tallest standing Roman wall in Britain today. The museum beside Jewry Wall is excellent too btw.)
http://www.amazon.co.uk/Richard-Plantagenet-Book-Tante-Desiree-ebook/dp/B0187RJR7E