Watch Paul McCartney, Taylor Swift and Jimmy Fallon Play an ‘SNL’ After-Party Jam Session

The celebrity-packed Saturday Night Live 40th anniversary special was a lot of fun to watch, but the after-party looked like it was even more of a good time. DJ Cassidy captured a lot of the action and posted clips and images on Instragram, including some of an epic jam session featuring Paul McCartney, Taylor Swift and Jimmy Fallon. Bill Murray even assisted on tambourine. Though, it really seems like they missed an opportunity to bring in a legendary cowbell player. You can see more of the clips over at EW.com …