A new Michael Jackson song entitled "This Is It" will be released as a single on Oct. 12. The song - which features backing vocals by Michael's brothers, the Jacksons - is part of a two-disc album of music inspired by the upcoming "This Is It" film, which chronicles Jackson's final days rehearsing for his comeback concerts before his death.

"This song only defines, once again, what the world already knows - that Michael is one of God's greatest gifts," said John McClain, who co-produced the album and is also a co-executor of Jackson's estate.

The "This Is It" double album will be released worldwide on Oct. 26 and in North America on Oct. 27. Two versions of the new song appear on its first disc, which also features original masters of Michael Jackson's hits in the order in which they appear in the movie. The album's second disc features previously unreleased versions of more Jackson hits, as well as a previously unheard spoken word poem entitled "Planet Earth."

Sony Picture's "This Is It" film hits theaters on Oct. 28 for a two-week run.