What do you get when you assemble 1,000 musicians in a single room for a performance? We’ll find out this Saturday (3/15) as the massive orchestra is assembled cavernous Colisée Pepsi sports arena in Quebec City to perform Gustav Mahler’s Symphony No. 8. The two-hour concert to launch the French Canadian capital’s year-long 400th anniversary celebration will be broadcast and streamed live by the WFMT Radio Network, including live presentations on flagship WFMT-FM Chicago and wfmt.com. Steve Robinson, WFMT’s general manager and executive producer for the Mahler broadcast, says the concert is being offered free, for live or later broadcast, to any radio station that’s interested.