Which artist co-wrote Elton John's 2010 album The Union?

Leon Russell co-wrote Elton John's 2010 album The Union.

The Union is a collaborative studio album credited to Elton John and Leon Russell. It was produced by T Bone Burnett and grew from John's admiration for Russell, whose work as a pianist, singer, and songwriter had influenced him since the early 1970s.

The record includes newly written songs by John and Bernie Taupin, with Russell contributing vocals and piano. It also features guest appearances from artists including Booker T. Jones, Neil Young, and Brian Wilson.

The album's title emphasizes the meeting of two generations of piano-centered American and British rock traditions. It is sometimes confused with John's earlier duet projects, particularly his 1993 collaboration with RuPaul or his 2016 album Wonderful Crazy Night. The Union is specifically the 2010 partnership with Leon Russell.