After performing at various venues for its past two seasons, the St. Louis Symphony Orchestra is gearing up to return to Powell Hall. The $140 million expansion and renovation will include an education and learning center, rehearsal space and places for the community to gather before and after performances. Music director Stéphane Denève and President and CEO Marie-Hélène Bernard discuss the past two nomadic seasons and how they’re looking forward to returning to Powell Hall in September.