Schubert faced constant rejection, yet his attempt to break into the world of theatre music with Rosamunde contains moments of sheer bliss. Prokofiev endured political and artistic exile, yet his second violin concerto is bursting with elegance. Still, each persisted in creating music of uncompromising beauty and honesty. Orpheus celebrates its first performance of Schubert’s brooding “Unfinished” Symphony and its first collaboration with the Georgian violinist Lisa Batiashvili.