All around the world humans keep cats as companions. And yet, unlike dogs, cats are also mysterious animals. Often they will slip out at night – but where do they go? In 1981, a musical (音乐剧) was performed in London’s West End for the first time that exploited (利用) the mysterious side of our favorite domestic pet. Cats, a musical with dancing composed (作曲) by Briton Andrew Lloyd Webber, is one of the most successful pieces of theater of all time.