Herbie Hancock dives into the Joni Mitchell songbook on his new album, "River: The Joni Letters," dye Sept. 25 via Verve. Mitchell herself sings on a new version of "The Tea Leaf Prophecy," while Tina

Herbie Hancock dives into the Joni Mitchell songbook on his new album, "River: The Joni Letters," dye Sept. 25 via Verve. Mitchell herself sings on a new version of "The Tea Leaf Prophecy," while Tina Turner takes the mic for "Edith and the Kingpin."

Other guests include Leonard Cohen on "The Jungle Line," Norah Jones on "Court and Spark," Corinne Bailey Rae on "River" and Luciana Souza on "Amelia." Hancock is flanked on the albums by such veteran musicians as Wayne Shorter, Dave Holland, Vinnie Colaiuta and Lionel Loueke.

Hancock and Mitchell previously worked together on the latter's 19XX album, "Mingus," on which Shorter also played. The new project also includes Shorter's "Nefertiti" and the Duke Ellington standard "Solitude."

As previously reported, Mitchell will release her Hear Music debut, "Shine," on the same day as "River: The Joni Letters."