I listened to Messiaen online ...naturally what I found, and I must say it struck me deeply.
I had never listened to anything [of his] before. In his compositions, I saw harmonic groups, but despite being dense and significant, they manage to be agile and accessible without creating listening discomfort.
Here are the pieces.
Cronochromie
Les merles noirs
Catalogue d'Oiseaux
I saw that Frank loves this author very much and it wouldn't be bad to have listening recommendations.
Even better, some files to try (that aren't a hell...to perform, ...naturally)
... let's just say that regarding his way of composing, there are several of his volumes in French to study (I thank his wife, unlike others, for having shared such a treasure).
Here you are lucky enough to come across one, the only one as far as I know, translated into English