The Quartet for the End of Time by Messaien. I once had to turn pages for a magical late-night performance by Endymion Ensemble with David Campbell on the clarinet. (Their usual clarinettist is Mark van der Wiel but he was off doing something else that night.)
Oh, plus one there. Some years ago, Seattle Symphony played Turangalîla with Thibaudet, and on the evening between its two performance he also joined 3 orchestra members in the Quartet. Laurie DeLuca's performance on the clarinet in Abîme des oiseaux was miraculous.
Which reminds me of the James Campbell / Allegri SQ disk with a bonkers arrangement for Clarinet of the Schubert Arpeggioni Sonata
Great choice.