The track, called 'Opis None' from the library of the Michael Jackson Secret Vault - the company that released the book 'Never Can Say Goodbye' - has hit the web, The Hollywood Reporter said.
Music label Sony is slated to release 'Michael', the long-awaited Jackson album on December 14 but the late star's mother has allowed a free leak of her own much before.
The twelve-minute long "song" featuring a mostly hushed Michael, meanders and saunters through lush soundscapes - guitars, strings, the sounds of children - while a driving beat keeps the tempo steady and groovy. Remixes are already popping up all over the web.
Katherine had reportedly objected to the upcoming Sony collection, the estate had questioned the authenticity of the Sony recordings, some of which came out of a 2007 session at the New Jersey home of producer Eddie Cascio.
Sony released a teaser for a forthcoming single called 'Breaking News' earlier this week - the song premieres on November 8