CHICAGO a cappella Featuring WTTW's Geoffrey Baer BUILDING AMERICAN POP APRIL 19-26 Chicago, Evanston, and Glen Ellyn Step into a musical time capsule as the ten singers of Chicago a cappella revisit the Brill Building era of the 1950s and '60s with WTTW's Geoffrey Baer. These irresistible pop classics evoke songwriting genius converging under one roofand their magic still strikes a chord today. TICKETS: 773-281-7820 | CHICAGOACAPPELLA.ORG photo: joe mazza - brave lux, inc. CHICAGO a cappella Featuring WTTW's Geoffrey Baer BUILDING AMERICAN POP APRIL 19-26 Chicago , Evanston , and Glen Ellyn Step into a musical time capsule as the ten singers of Chicago a cappella revisit the Brill Building era of the 1950s and ' 60s with WTTW's Geoffrey Baer . These irresistible pop classics evoke songwriting genius converging under one roof and their magic still strikes a chord today . TICKETS : 773-281-7820 | CHICAGOACAPPELLA.ORG photo : joe mazza - brave lux , inc .