It's true! It closed in 2008, but it was announced that it just revived, and its taking a World Tour, starting in new Zealand. it takes most of its songs from the books. Only a few characters resemble the movie versions, so most are imagined. There's Elvish in the songs - Quenyen (I don't know how to spell it), because the producers thought it would fit the characters better. It's three hours, one hour for each book.

The songs of the Original London Cast:

https://www.youtube.com/watch?v=nZLGC9NJQcA

And a picture of some major characters: