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
'A Letter Home' was recorded on 'ancient electro mechanical technology'
It follows Young's two 2012 releases 'Americana' and 'Psychedelic Pill'
Album allegedly recorded at White's Third Man studio and will be out this spring
The singer-songwriter also got cross at people singing along at the Carnegie Hall show
The event will raise money for Flea's Silverlake Conservatory of Music
The band will no longer be appearing in Liverpool and London later this month
Frank 'Poncho' Sampedro says 'my gut tells me this is really the last tour'
They will play four shows, including London's O2 Arena next June
The rocker made the comment about the U2 frontman during a Twitter Q&A
All-star line up in California also sees Jack White and Foster The People perform
The Canadian singer has unfinished business with his '60s band
Young says his high-resolution music service will "save the sound of music"