Nice try. It is in fact Boccherini's Minuet.
As the Butler leads you through one more corridor, which turns slightly, he leads you into a far larger and higer room, with more of the same decor, bookcases also. To one side of the doorway is a raised area and a pedestal where a string quartet is playing the Minuet. Each of the players is also in a blank white mask.
And on the far side of the room, the decor gives way to a slightly more metallic look, where about foru or five people in green outfits appear to be overseeing some form of large metallic device.