Tucked inside a press release about the Baltimore Symphony’s April 16 concert at Carnegie Hall was one eye-catching detail: Before the program’s centerpiece of Mahler’s Fifth Symphony, Marin Alsop is slated to conduct the premiere of Kevin Puts‘s The City, a long-scheduled piece whose creation took on “added focus,” after last year’s rioting and protests after the death of Freddie Gray. It will be accompanied by a film by…