It's a rich week for music in New York: Andriessen's De Materie is playing at the Armory, in the Heiner Goebbels production, while the entirety of Stockhausen's KLANG is about to resonate through various venues of the Met Museum, including the newly appropriated Breuer building. KLANG is a production of Joseph Drew and Analog Arts; for more, see their website. Also, Ensemble Signal essays Abrahamsen's Schnee tonight at Miller Theatre; Anthony Roth Costanzo sings Matthew Aucoin's Orphic Moments at National Sawdust; and James Blachly's Experiential Orchestra presents a full circus rendition of Petrushka on March 26.... MusikFabrik is preparing a major new work by Liza Lim, the opera Tree of Codes, based on the work by Jonathan Safran Foer. In an essay on her website, Lim discusses her use of field recordings of Australian magpies. The première is in Köln on April 9th; let's hope adventurous American presenters take a look.... The superb contemporary-minded cellist Séverine Ballon plays Lim's Invisibility at LA's Monday Evening Concerts on March 28; the program also has works of Rebecca Saunders, Chaya Czernowin, Mauro Lanza, and Ferneyhough.... The revitalized Louisville Orchestra launches an American Festival this weekend with a program including Ives's Thanksgiving and Forefathers' Day, Copland's Clarinet Concerto, Antheil's Jazz Symphony, Meredith Monk's Songs of Ascension, and Steve Reich's Three Movements. Teddy Abrams, Louisville's energetic young director, conducts and also plays clarinet. Good luck discovering any of that from the orchestra's website.... Philip Glass, John Luther Adams, Steve Schick, Nico Muhly, Maya Beiser, and Eighth Blackbird are among the classical figures congregating in Knoxville, Tennessee next week for the all-consuming Big Ears Festival.... A major Luigi Nono conference entitled Utopian Listening is under way at Tufts University in Medford MA, with Harvard co-sponsoring and Nuria Schoenberg-Nono in attendance. The focus is on the later electroacoustic music; there are three concerts this weekend.