They have a huge collection from around the world, most of which is kept locked away. If you ask nicely they may show you some of the hidden collection - one of the nice things about off-the-wall museums is the amount of individual attention a visitor receives (though they won't let you play the instruments).

Isaakievskaya Ploshchad 5. Metro: Nevsky Prospekt then trolleys 5, 14 or 22, or 15 minute walk. Ticketing office open 12:00-17:00 Wednesday to Sunday. Tel: 314 5394.