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
Dizzee Rascal - I Don't Need a Reason
PSY - GANGNAM STYLE
We're NASA and We Know It (Mars Curiosity)
Hindsight being 20/20, I probably wouldn't have done it the same way. ~Wanderlust gif