Nirvana frontman included a snippet from one of Young's lyrics in farewell letter
Neil Young and Crazy Horse release their second album of the year, 'Psychedelic Pill', in October
The singer quit alcohol and marijuana for a 'different perspective'
His second album this year with Crazy Horse is out on October 29
Folk legend and his band have put their own spin on the UK national anthem
Rocker trademarks 'Ivanhoe' and 'Thanks For Listening' as possible names for MP3 alternative
Legendary rocker also says digital market is 'degrading our music'
'Horse Back' was released online over the weekend
A further album is also apparently in the works
Rock legend also talks up his love of Mumford & Sons and My Morning Jacket