Welcome to Mondavi Center, Don Roth! The performing arts center's new executive director is pictured in the Mondavi lobby soon after he took up his new post June 1. Roth is the immediate past president of the Aspen Music Festival and a former general manager of the San Francisco Symphony. Mondavi Center is now selling subscriptions for the 2006-07 season, scheduled to debut Sept. 22 with a concert by Bo Diddley, in a new Mondavi series called American Heritage, this year focusing on the blues.