Jimmy Fallon brought out David Crosby, Stephen Sills, Graham Nash, and "Neil Young" for a rendition of the pop-rap song "Fancy" that is playing on almost every radio station (except ours thankfully):

Speaking of Graham Nash, he is signing his book "Wild Tales: A Rock & Roll Life" at Barnes and Noble at 555 5th Ave at 12:30pm Today

Here's our interview with him from last week: