A sinister gnome, talking skulls with glowing eye sockets, a wooden hut running off on chicken legs: Mussorgsky’s Pictures at an Exhibition is a cabinet of wonders you can wander through in amazement. Bizarre fantasies alternate with breathtaking vistas. A poetic highlight is The Old Castle, steeped in longing for a distant past—the same nostalgia that inspired Tchaikovsky’s delightful Rococo Variations.