His most famous ouverture took themes from the folk song "By The Gates" and the Marseilleise.  
Nicolas Rubenstein, the dedicatee of this man's first piano concerto in B minor, declared that piece unplayable.  His first symphony, "Winter Dreams," and his second, "Little Russian," were composed at the Moscow Conservatory, while his operas Mazeppa and The Sorceress were composed under the patronage of Madame von Meck.  One symphony by this composer was inspired by Byron's poem (*) Manfred, and his third in D major is nicknamed Polish.  His most famous ouverture took themes from the folk song "By The Gates" and the Marseilleise.  For 10 points, name this Russian composer of the Pathetique symphony, the 1812 Overture, and the ballet The Nutcracker.
Nicolas Rubenstein, the dedicatee of this man's first piano concerto in B minor, declared that piece unplayable.  
Piotr Ilyitch {Tchaikovsky}