Musical theater is the most developed in the UK. British musicals originated from revues and musical comedies in the mid-19th century, and later evolved into the musical form we are familiar with today. Famous musicals such as "Les Misérables", "Cats", "Phantom of the Opera", etc. are all British classics. London's West End is the heart of British musicals. There are many theaters with long history and advanced facilities, attracting many musical fans.