Gilbert and Sullivan Archive on the Web

Via MetaFilter, you can now view all of Gilbert and Sullivan's work at the Gilbert and Sullivan Archive. Works include:

• The Mikado: "Includes MIDI files for all of the music from the opera -- nearly 1 hour and 20 minutes of music -- accompanied by an illustrated libretto so that you can sing-along with the music."
• The Pirates of Penzance: Illustrations, discography, music files - "Tit Willow, Tit Willow!!!"

Related: There are a lot of great archive sites on the Web - check out my list of Archives on the Web; I've got news archives, national archives, movie archives, and more.