Source: Alex Ross, lots of good links and starting points here for the exploration of this genre.
In my column this week on the wide world of Wandelweiser, I mention Jennie Gottschalk’s new book Experimental Music Since 1970 (Bloomsbury). Jennie has built an amazing website called Sound Expanse, which contains vast quantities of material relating to the exploratory music of recent decades. A few days ago she put up a Wandelweiser page, gathering links to many of the principal composers. See also her previous “resource guides” to Jürg Frey and Michael Pisaro, either of which will keep you listening for hours.