The notes accompanying this clip:
We loved the song "A Beautiful Mine" by RJD2 that plays during the opening credits of "Mad Men." We wanted to put lyrics to it and realized that "Nature Boy" made famous by Nat King Cole, and written by eden ahbez, was the perfect fit. This was filmed in one take (this one, specifically, happened to be take 29 of the day)...no cuts, dubbing, lip-syncing or auto-tuning. More videos coming soon...This is a Video Recorded Live.
This is the piece that was sampled for the theme: