Dan was yesterday onLate Night with David Letterman to record the perfomance with the cast of How To Succeed in Business Without Really Trying. They performed Brotherhood of Man Below the photos of Dan leaving which were released now. The Late Night with David Letterman with Dan airs tonight at 11:35pm EST.
Update: A short video already popped up online! If we have more, you find it here. Update: You can also watch the episode on the site from David Letterman Update:A video below. the whole part with their performance.