The supergroup have been working on updating 'Holy Man', which was co-written by late Beach Boys member Dennis Wilson and his lead singer brother Brian, 75.
Dennis' co-writer Stephen Kalinich is the only person who was able to hear the song in its original form and he claims he hasn't had access to it for more than three decades.
The 'Little Bird' drummer tragically drowned at Marina Del Rey in 1983, and the track has been stored away in a vault ever since.
A source said: ''The song is in a vault and nobody can do anything about it.
''It's such a shame as there will clearly be a huge demand for it.''
Dennis's co-writer Stephen says it is ''such a shame'' that no one will be able to get their ears on the ''six-minute masterpiece'' because of the law.
He told The Sun newspaper: ''It's over six minutes long and it's a masterpiece, but we've never been able to release it because we can't get the legalities worked out. Such a shame.
''People hear it and, honest to God, it brings tears to their eyes.''
Foo Fighters' drummer Taylor Hawkins recorded vocals on their version and Stephen says he sounded just like Dennis with ''the same gravelly, whisky voice''.
He added: ''Taylor sent the track to Brian May and he and Roger Taylor fell in love with it. They spent weeks fooling around with it, putting on vocals and some incredible percussive things.''
From their newest EP 'What Did You Think When You Made Me This Way', Nothing But Thieves drop the lyric video for their single 'Take This Lonely...
The Lumineers honour their friend and hero Tom Petty with a sensational cover of his 1996 song 'Walls' from the 'She's the One' soundtrack.
Watch Olly Murs get his nerd on as he blags his way into an exclusive Snoop Dogg party (where Rowan Atkinson is the bartender) in the video for their...
From 'Happy' to 'Banana Pancakes', these are soaked in positivity.
Mariah Carey is the picture of glamour in the black and white video for her brand new single 'With You'. It's the lead single from her forthcoming...
Eminem draws attention to the negative response his 2017 album 'Revival' received in the video for his latest song 'Venom'; a song recorded for the...
With the recent release of her third, very well received album 'Hunter' just behind her, Anna had plenty of relatively new songs to showcase.