It's by Fleetwood Mac:
It's funny to watch Paul Rudd dance to this song in the 12-7-2013 episode.
Too bad that's not on YouTube,
Stashed in: Music Videos!, SNL
Arctic Monkeys live - From Ritz to the Rubble - YouTube
Weird Al Yankovic - Hardware Store
Azealia Banks - 212 Ft. Lazy Jay
Freddie Mercury vs Beyonce