Spem In A is really a hard piece to pull off without the words so Mike has had a challenge and it proves yet again that you can get something wonderful out of 'trons but there has to be music with integrity to work with. Mike and I know this piece backwards and have discussed it's merits for many a long year. It is a masterpiece of 15th century composition, full of controlled yet at times, wild dissonances, sadly discarded when Baroque turned up. Listen for the wild woman towards the end, bladdered on mead and doing free form. Just great.
I still say this is the greatest musical accomplishment in the history of our species. I simply cannot encompass the mind that put this together in such unerring detail.