Fact about circus is that it has its light and its dark side, as practically everything else. It brings joy to people but many circuses mistreat animals. It shows limits of human body and mind, which is a wonderful thing to see, but when those limits are crossed - tragedy awaits. And all that is circus.
Circuses can look like joyous places and some of them are but those that hold wild animals can paint a different picture. Here you can read many interesting facts about circuses.
You probably can't imagine a circus without some sort of a clown. And clowns are with the modern circus since its beginning. They are necessary part of the act and they job is to bring on the laughter.
Circus music is an inseparable part of circus as long as the circus exists. It evolved in parallel with circus and today accompanies a modern variant of circus and gives it more depth.
Some circuses are very big. The greater they are - the more famous they are. But not all circuses go for the size and they are not any less famous because of that. Such are flea circuses. Read more about history of flea circus.