Several of the cast members of The Avengers were on the James Corden Show and sang a version of "We are The World" ( 8:30ish mark)
James Corden had Don Cheadle, Benedict Cumberbatch, Zoe Saldana, Chris Pratt, Tom Hiddleston, Paul Bettany, Anthony Mackie, Sebastian Stan, Pom Klementieff and Josh Brolin join him in a tour bus.
After showing them some "sights", they went to a comic book store to sign autographs, and finally sang a version of "we are the world"
K.C.-ya!