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I made a serious omission when I wrote the guide to music in Chicago in the Reader’s Chicago 101 issue a couple of weeks back. The Chicago Cultural Center (78 E. Washington) is one the city’s real gems as a venue for music–as well as for visual art, dance, film, and just about every other medium. There are free concerts there every day, usually by acclaimed local performers representing a host of genres, and the space also presents higher-profile gigs several times each month that focus on jazz, experimental, and international music. On Thursday, October 5, at 7 PM in the Claudia Cassidy Theater the excellent San Francisco electronic duo Matmos will perform with the New York new-music ensemble So Percussion. Matmos performed earlier this summer at the Pitchfork Music Festival in support of their superb recent album, The Rose Has Teeth in the Mouth of the Beast, but this marks the local debut of So Percussion.