Conversation so far:
What is Tristan and serialism and its connection with Olivier Messiaen?
Two years after Visions de l'Amen, Olivier Messiaen composed the song cycle Harawi, the first of three works inspired by the legend of Tristan and Isolde.

Question: What was the song about?
Self-contained rewrite: What was the Olivier Messiaen song cycle Harawi about?