Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Valleys of Neptune is a posthumous studio album by American psychedelic rock musician Jimi Hendrix. Released in the United States on March 9, 2010, the album boasts "12 previously unreleased studio recordings,"[1] including the title track, "one of the most sought after of all of Hendrix''s commercially unavailable recordings." The tracks on Valleys of Neptune were largely self-produced by Hendrix, and received extra posthumous production from Janie Hendrix, Eddie Kramer and John McDermott for Experience Hendrix, L.L.C.