'Beautiful Day' (2000)
It's a beautiful day/
Don't let it get away
According to stag1333, "Beautiful Day" by U2 (pictured), "Signed, Sealed, Delivered I'm Yours" by Stevie Wonder, and "Ain't No Stopping Us Now" by McFadden and Whitehead should all make it into the president-elect's earbuds. Incidentally, U2's tune was also John Kerry's song of choice during his 2004 presidential campaign.
Video: "Beautiful Day" by U2.
Pictured from left: Bono and The Edge of U2.