One of the great composers obviously though personally I don't get opera. I like Tristan best but Götterdämmerung is another one of those I went into the trouble of listening to because Nietzsche pokes fun at it in the title of one of his best books.
There's the scene of immolation of Brünnhilde, which got me thinking, what if it's Trünnhilde and she's self-immolating due to regret over a certain life-changing decision?
https://www.youtube.com/watch?v=nj3Zyhk58Bw