River: The Joni Letters is a tribute album is to Joni Mitchell, a longtime associate and friend of Hancock. Both Hancock and saxophonist Wayne Shorter previously collaborated with Mitchell on her 1979 album Mingus, and both continued to collaborate on occasion ever since. The album won the Album of the Year and Best Contemporary Jazz Album at the 2008 Grammy Awards, beating off competition from Kanye West, Foo Fighters and Amy Winehouse.
This track is Edith And The Kingpin, originally written by Mitchell for her 1975 album 'The Hissing of Summer Lawns' and features Tina Turner. Herbie has a way of finding new levels from artists; Tina should really do more material with him.