Fantastic Planet (1973)

This French animated film originally called La Planète sauvage directed by René Laloux, stands out as one of the most strange and amazing animated features.

The story itself is really beyond explanation, but it mostly delves in the idea of humans being kept as pets by a strange foreign species. One of the humans decides to escape, and film is his advnture. Mostly told in pantomime, I belive the english speaking version is posted in full here:

The music is a weird electronic, funky mixture. Aficionados will recognize the samples from most of Madlibs Quasimoto LP (2000).