I read a story somewhere about Manoir de mes Reves, how he ''made'' the song. The story goes that he had a dream that he was in a castle where somebody was playing a organ. He was playing the mes Reves tune. Its clear that that tune is called "Castle of my Dreams".
But what about Artillerie Lourd, does it has something to do with the town Lourdes in the south of France. And why did he call the tune Caverlie "cavelrie", does it has something to do with war. And clouds, when day is done.... etc. :?