Ok ignoring the fact that this isn't a speaker, if it was and the question is what would I play on a speaker this size, then probably this.

I've spent 5 minutes trying to work out what this image is of, without luck.

Anyone able to give an ELI5 to a non-American? I understand the current situation and what happened yesterday, is there a problem with Milwuakee or this art center specifically?

Well done and many thanks!