Maestronet
http://www.maestronet.com/
Players and collectors of classical stringed instruments will find Maestronet's site useful for finding and pricing the Stradivari of their dreams. The Instrument Showroom databases provide listings of instruments from around the world, as well as price information. The Conservatory section includes sheet music in Adobe Acrobat format, which you can download and print. MIDI files of this music are also available, so that your computer can accompany you as you play!