Math rock, noise rock, experimental rock -- it doesn't matter what you call Battles when they're rocking City Hall in Paris. Whatever you call it, it's like seeing rock royalty.  City Hall is a magnificently ornate building built in 1892 and witness to many historic events, from the French Revolution at the end of the 18th century all the way through to the strange night in 2011 when the New York band was somehow given permission to set up their gear inside and film the results.