By Mandi Bierly
Updated January 26, 2009 at 12:00 PM EST

Today, The Phantom of the Opera, already the longest running show in Broadway history, becomes the first to celebrate 21 years on the Great White Way. More than 13 million people have seen the musical at the Majestic Theatre. This evening marks its 8,732nd performance. Share your Phantom memories below. A clip of Michael Crawford and Sarah Brightman performing at the 1988 Tony Awards for inspiration…