Now, I don't know much about ballet, but I suppose I do know enough to see how this caused riots back in the day:
They say both the composer and choreographer were distraught that it was received so poorly, but at least one critic liked it. (Check out the Wikipedia article. P.S. this was early 1900s, everyone.)
(And, interestingly, it's remembered now for its innovative music, but the riots were over the choreography. FYI, this clip tries as best as it can to replicate the original choreography. I guess what the choreographer should have dwelt on was that it had supporters (in addition to opponents), hence the fighting? And that people felt so strongly about it, isn't that something choreographers go for?)
Now, perhaps unbeknownst to you - were you aware of what you were watching, actually? Mostly I got that there were a bunch of Native Americans dancing around - there are elders and groups of guys and girls, and it's probably a ritual, and the ritual aspect was apparent from the title.
Well, P.S., that was a fertility ritual! Yeah, don't your innocent eyes feel a little weird now? And the basic premise of this ballet (I looked all this up after I'd watched the clip) is the preparation of a girl being sacrificed to bring the gods' benevolence for the coming spring.
Now that we all feel enlightened, comment on my post!