Justin Timberlake opens the 2013 Magna Carta album of JAY-Z ... Holy Grail with one of his finest vocal performances on 'Holy Grail' in his career. The part of JT was originally written by The-Dream, who laid it down initially before Justin decided to perform on the album.

Yesterday during his songwriter battle with Sean Garrett, The-Dream played the version of the song with him on, after joking that JAY-Z was going to kill him for doing it. You can check out that clip above.

Tonight, the studio version has appeared on TIDAL. Not only is The-Dream on it, but the beat is very different. You can listen to it below.