For Butcher, for a start, try "Fixations" "Optic" and "News from the Shed" on Emanem (can order directly from them), or some of the titles on Clean Feed. This is really just scratching the surface. Butcher, I think, is one of the most creative minds in music today.
Oh, btw, somehow or other I forgot to list Cecil Taylor in my initial post. So consider it listed