Photo credit: Matthias Baus Anna-Sophie Mahler’s new production of Olivier Messiaen’s “Saint François d’Assise” will make its premiere at the Staatsoper Stuttgart on June 11. The piece will be presented in an unconventional manner. The audience will be led on a journey from the opera house to the Killesberg open-air stage and back. The nearly four-hour opera becomes an “eight-hour {…}