CLEVELAND, Ohio – By now, the passing of Christoph von Dohnanyi is international news. Music lovers the world over are in mourning, grieving the death of a giant. Here in Northeast Ohio, though, the loss is personal. During his largely triumphant 18-year tenure as music director of the Cleveland Orchestra, the German maestro, who died Sept. 6 at age 95, forged in the region not only an incredible artistic legacy but also a vast network of connections, many of them close and lasting. For those people, this moment is complex, awash in emotion. Feelings range from simple sadness to profound...