Luciano Berio is one of those postwar modernists who've injected folk elements into their compositions for the sake of political posturing. His Folk Songs From 1964, to be performed by Concertante di Chicago and mezzo-soprano Robynne Redmon, were compiled and transcribed when the Italian avant-gardist was in residence in the Bay Area. Based on folk tunes from, among other places, America, Sicily, and Armenia, the songs reflect the concerns and idealism of the counterculture movement. Not meant to be authentic, each song nevertheless remains true to the spirit and the instrumental colors of the original. From the same mold is Dance of the Blind, a work for accordion, violin, viola, and cello by Canadian composer Marjan Mozetich, a former student of Berio's, that evokes the carefree ambience of a workers' cabaret. Also on the Concertante di Chicago's thoughtful program are the well-known Fantasia on Greensleeves by Vaughan Williams and the Divertimento no. 1 by Leo Weiner, an obscure contemporary of Kodaly and Bartok; both works incorporate folk materials in a more literal manner--by simply quoting them. Falla's fiery El amor brujo rounds out the concert. Joseph Petric is the accordion whiz; Hilel Kagan conducts. Sunday, 3 PM, concert hall, DePaul University, 800 W. Belden; 454-3030.