In his Epistles, the poet Horace decried the constant din of first-century-BC Rome: “Would you have me, amid so great noise both by night and day, try to sing?” But sing he did. A similar tension energized “my eyes . . . my ears . . . ,” the performance by O+A (sound artists Bruce Odland and Sam Auinger) at District Hall on Friday, sponsored by the Goethe-Institut and Non-Event.