Will J.J. Abrams Reboot ÏThe Colbert Report ?

The transcript describes the farewell episode of the Colbert Report, featuring a star-studded guest list including John Stewart, Katie Couric, and others. Stephen Colbert humorously announces the show's end, joking about a future reboot by JJ Abrams. The episode concludes with a joyful sing-along led by Randy Newman, and Colbert's whimsical departure in Santa's sleigh with a unicorn and Abraham Lincoln.

Which song was played during the joyous sing-along at the end of the night?

What humorous imagery did Colbert use to describe his departure?