Piano masters Leon Russell and Elton John have been friends since the 1970s, but The Union represents their first-ever set of collaborations. Though John’s name owns more of the marquee, Russell is no slouch. With hits “A Song for You” and “Delta Lady” on his resume, in addition to session work with The Rolling Stones, Clapton, Phil Spector, Joe Cocker, and a host of other stars, the Oklahoman is as legendary as he is under-appreciated. Earlier this year John and Russell gathered in the studio with Grammy Award-winning producer T-Bone Burnett and John’s longtime lyricist Bernie Taupin, and the group sketched out a set of tunes that dabble in rock, country, gospel and R&B. Both Rusell and John play piano and sing, making for The Union’s soulful, big-bodied sound. The album’s impressive roster of guest stars includes Neil Young, Brian Wilson, Booker T. Jones, and Robert Randolph.