The MATA Festival this year takes up residence at (Le) Poisson Rouge, everyone's favorite classical-cool hangout. Tonight (Friday) it's the NOW Ensemble and David Moore; tomorrow, SO Percussion. Tickets are $10-15. On Sunday night the same venue hosts Keys to the Future; the minimalist-flavored program includes works of Howard Skempton, Ryan Brown, David Lang, John Adams, Nico Muhly, and Steve Reich. David Robertson and the great St. Louis Symphony — which has so far resisted the downward trends that are roiling the orchestra business — come to town with two contemporary-minded programs: tonight they are joined by composer-chanteur HK Gruber for his classic Frankenstein! (the concert also includes Hindemith, Satie, and Mozart's Musical Joke), and tomorrow night they play Kaija Saariaho's Mirage for soprano, cello, and orchestra, with Karita Mattila and Anssi Karttunen (alongside Wagner's Good Friday Music, Bernd Alois Zimmermann's Canto di speranza, and Sibelius's Luonnotar and Fifth Symphony). Eddie Silva's SLSO blog is always worth reading. The New Juilliard Ensemble gives a free concert tonight, presenting works of Lotta Wennäkoski, Betty Olivero, Stefano Gervasoni, Barrett Ansbach, and Erkki-Sven Tüür. Klangforum Wien arrives at Alice Tully on Saturday; music of Aperghis, Feldman, Schoenberg, and Beat Furrer is paired with films by Man Ray, Bady Minck, Maya Deren, Tim MacMillan, and Pipilotti Rist. Joshua Fineberg's electroacoustic opera Lolita can be seen all weekend at Montclair State in New Jersey, courtesy of the Argento Chamber Ensemble. There's a video preview. The New York City Electroacoustic Music Festival runs at the CUNY Graduate Center. And on Sunday night Philip Glass plays the City Winery with Patti Smith.