This Friday night, Terry Riley, the Kronos Quartet, Stuart Dempster, Jon Gibson, Katrina Krimsky, Morton Subotnick, Ustad Mashkoor Ali Khan, Sidney Chen, Dennis Russell Davies, Loren Kiyoshi Dempster, Bryce Dessner, Dave Douglas, Trevor Dunn, Jacob Garchik, Philip Glass, Osvaldo Golijov, Michael Harrison, Michael Hearst, Scott Johnson, Joan La Barbara, Saskia Lane, Alfred Shabda Owens, Elena Moon Park, Lenny Pickett, Gyan Riley, Aaron Shaw, Judith Sherman, Mark Stewart, Kathleen Supové, Margaret Leng Tan, Jeanne Velonis, Wu Man, Yang Yi, Dan Zanes, Evan Ziporyn, Koto Vortex, Quartet New Generation, So Percussion, members of the GVSU New Music Ensemble, and members of the Young People’s Chorus of New York City — the usual suspects, in other words — will gather in the main room of Carnegie Hall to celebrate the forty-fifth anniversary of Riley's In C. For interviews with various participants, go to Kronos's Facebook page or follow the links at The Standing Room. Justin Davidson has a poetic preview; Steve Hicken has fifty-three thoughts. And keep in mind Robert Carl's book on In C, which Oxford University Press will release this summer. He talks here.