If Wilson tries to make his art match his subject's music, Rod Hamilton's new Untied series is attempting to bring art music into new contexts. Concert music-also known as classical music or Western art music (since classical is technically a period within the music)-can have a pretty stuffy reputation, despite the fact that many contemporary composers are making music that is as adventurous and exciting as anything going. Untied begins Saturday, April 6, with Steve Reich's "Six Pianos," "The Park" by Robert Ashley, and Andrew Bernstein's "A Boundless Mass of Transparent Jelly." These works will be performed by some of the city's most exciting musicians at the Coward Shoe Building (322 N. Howard St.), a gorgeous venue with big windows behind performers, known more for its punk shows than its classical chops. There are also going to be sound installations by Grayson Brown, Salvatore Farina, Colin Zwiefel, Peter Tran, and Sasha de Koninck. Things kick off at 9 P.M. and cost $7.