I'm currently without internet in Cali right now so shouts to Illy for helping with this post. Anyways, right after Jay performed alongside Bono, The Edge and Rihanna at the Hope for Haiti Now benefit in London this went up on iTunes. Stream only as the song was done for charity. So if you want the .mp3 chuck up the .99 cents and grab off iTunes.
Hit the jump for the live performance.