Epic musical Les Miserables will make theatre history on 8 October (06) when it becomes the longest-running musical ever to play on either Broadway or the West End. The London production will celebrate its 21st birthday on that date and pass CATS for the record the following day, with an amazing 3,872 performances. The landmark will be celebrated on 7 October (06) in London with a performance featuring original cast members COLM WILKINSON, Patti LuPone, FRANCESS RUFELLE and MICHAEL BALL.