Cozy Lower East Side loft space Spectrum hosts its second annual NYX fest, a proggy celebration of the convergence between arty rock and edgy classical music. Fri 12 is devoted to the Chapman Stick, as played by Greg Howard and Michael Bernier. Seven sets on Sat 13 include outings by Dalit Warshaw (2pm), Marilyn Nonken (5pm), Ron Anderson (8pm) and Kayo Dot (9:30pm); on Sun 14 you can hear, among others, Sarah Cahill (2pm), Grey McMurray (3:30pm) and Nick Didkovsky (6:30pm).