A little late for Ravel's 150th, but this was my great (ahem) gateway to Ravel's orchestrating genius. I heard his orchestration before I heard Mussorgsky's solo piano version, and have since fallen in love with his genius. Even from his treatment of the opening Promenade, there's a bit more breadth, a bit more gravitas, a bit more there there. Not afraid to solo instruments, or interleave solo instruments against a delicate backdrop of small subsets of the orchestra, it is a masterpiece of restraint. cf. "The Old Castle" movement
All the better to contrast the bombast. cf. "The Great Gates of Kiev" movement