The musician's social networking account was tweeting NSFW images and text
Young records cover of Willie Nelson's 'Crazy' as part of Jimmy Fallon show
The record went on sale last night (April 18) with no announcement made
Singer wants to 'focus on other works' instead of four-album box
Singer-songwriter was not happy with audio quality of 1978 album
The musician launched his high quality digital Pono music player at SXSW yesterday (March 11)
The iconic musician launched his new digital player and music service in Austin, Texas
The singer will outline launch plans for iTunes rival during keynote speech at the US festival
The band cancelled a gig in the city in 2013 because of an injury
He will also release an album this year on Jack White's Third Man Records