The Union.

In November 2009, filmmaker Cameron Crowe began filming a behind-the-scenes look at the creation of the album The Union, a collaboration between musicians Elton John and Leon Russell, who hadn't spoken to one another in 38 years prior to beginning work on the album. In addition, the documentary offers a rare glimpse into the process John goes through to create and compose his music. Featured in the film are musicians Neil Young, Brian Wilson, Booker T. Jones, steel guitarist Robert Randolph, Don Was and a 10-piece gospel choir who all contribute to the album, which is produced by award-winning producer T-Bone Burnett. Musician Stevie Nicks and John's long-time lyricist Bernie Taupin also appear.