This one was a very very very hard anime to pidgeon hole. At times it could be rather immature, at others very profound and unnerving, and more often than not completely baffling.
The pacing is pretty consistent and helps to keep one in the flow of things (usually the story moves along in 3 part chapter type stories, than moves on to another one after that chapter is finished). In fact, within the anime the episodes are kind of presented as movements in musical piece, thus giving a fun little nod to its title.

This is not an anime to watch for a quick laugh, or a quick scare, or a quick anything really. It spreads its wings across vast areas, so one must watch the whole thing to get all that it has to offer. Just be prepared to be scratching your head...