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When former Reader staff writer Peter Margasak began programming the Frequency Series in 2013, he envisioned concerts that would expose audiences of different avant-garde musical disciplines to artists from other genres that they had not heard before but might well appreciate. Margasak left the Reader and Chicago in order to move to Rome in 2018, but he’s continued to program the series, which usually takes place on Sunday nights at Constellation, as well as a semiannual festival.…