Entr'acte (1924) includes music by Eric Satie:
I watched it, of course, and am thoroughly confused, though I do want to say we love that camel, especially the hearse on a roller coaster part. I expected it to make some coherent sense and it didn't make the kind of coherent sense I expected. There is information on and evaluation of the film short here, at FilmReference.com and at ubu.com. House of Mirth and Movies has a review.
Paris Qui Dort (1925) is available at DailyMotion.com here:
There is information on this short science fiction film at FilmsDeFrance.com. There are no English intertitles, but it's easy enough to understand from the plot summary at Wikipedia:
The film is about a mad doctor who uses a magic ray on citizens which causes them to freeze in strange and often embarrassing positions. People who are unaffected by the ray begin to loot Paris.
You can see a 17-minute BBC documentary on Clair at ubu.com. It includes biographical material and interviews.