“The radical fringe of serious music isn’t on Manhattan’s Lower East Side or at George Crumb’s house in suburban Philadelphia. It’s among the mystical and the devout of Eastern Europe and Russia, collectively called “holy minimalists” – and they’re championed by some of the world’s best-known performers. Spare in the extreme, might the music be too much an afterthought of the composers’ inner experience? Or do we just need a few decades to figure it out?”