A decade ago, Herbie Hancock’s latest surprised both jazz enthusiasts and mainstream audiences – and now, it’s available in a new expanded edition. Verve and UMe will reissue Hancock’s River: The Joni Letters for its 10th anniversary this Friday, December 15. The original album, mostly featuring songs of Joni Mitchell, will be paired with a bonus EP of four additional recordings from the sessions. Two of them – covers of “A Case of You” and “All I Want” – were previously only available on an Amazon-exclusive pressing of the album, while the…