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.
What was the Olivier Messiaen song cycle Harawi about?
Harawi is the first part of Messiaen's 'Tristan Trilogy', preceding the Turangalîla Symphony and the Cinq Rechants.

Question: Was he commissioned to write any other songs?
Self-contained rewrite: Was Olivier Messiaen commissioned to write any other songs besides Harawi?