A previously unheard Michael Jackson song has been released.

'Don't Be Messin' Around' was not deemed good enough by Michael to feature on his 1987 album 'Bad', but is being made available as part of the album's re-release, and goes on sale as the B-side to a new version of the album's first single, 'I Just Can't Stop Loving You' in the US from today (07.06.12).

Michael - who died in June 2009 of acute Propofol intoxication - wrote 'Don't Be Messin' during the sessions for his second album, 'Thriller', with engineer Brent Averill. In the recording he can be heard ad-libbing and giving instrumental instructions.

Matt Forger, a sound engineer and friend of Michael, who worked on the track, told TheAtlantic.com: ''You can just hear him having fun. His spirit and emotion are totally there. He knew in demos he didn't have to be totally perfect in his execution.

''So he'd be loose. He'd throw in ad libs and dance or sing or pop his fingers or clap his hands. You just hear him enjoying himself.''

The 'Bad 25' album, which will also feature unseen live footage from one of Michael's Wembley, London, concerts in 1988, will be released in the UK on September 18.

It will be much more raw and natural sounding then the 'King of Pop's first posthumous album, 2010's controversial 'Michael', which was slammed by family members, who claimed Sony Music hadn't used his real vocals.