An American music director is increasingly expected to be all things to all people, and when a major orchestra loses one of the good ones, as the Pittsburgh Symphony unquestionably has with the departure of Mariss Jansons, it can be difficult to know what course to follow next. That’s why the PSO’s decision to hire three well-regarded conductors to handle the various duties with which a music director would ordinarily be saddled is “a refreshingly honest response to difficult and conflicting realities,” says Mark Kanny. “Here is a trio that has the potential to excel in a broad range of repertoire few other orchestras will be able to match.”