Work: Nun komm, der Heiden Heiland in A Minor, BWV599

The more you read about music, the more you notice the word “authenticity” cropping up annoyingly frequently. The great raging musical arguments of the late 20th century still burn; performers, listeners, even composers find themselves having to take up quasi-moralistic stances on gut strings, vibrato, and whether trills should begin on the upper or lower note.