(Photo: Marcello-Orselli) “Tristan und Isolde” is a colossal work, not only for its length (five hours, including two 30-minute intermissions), or for the influence of the famous Tristan chord on Western music, but also for the symbolism it represents. Wagner was hugely influenced by Schopenhauer’s philosophy when he wrote this masterpiece, while conducting an affair with Mathilde, the wife of {…}