Musical Allusions 2 by AlexanderD

Question 12

An accidental holiday classic, Dan Fogelberg's "Same Old Lang Syne" references TWO works. One is, obviously, "Auld Lang Syne", which is performed on the saxophone at the end. The other, referenced musically in the verses, is from what 1880 Tchaikovsky opus?

The 1812 Overture