Michael Jackson's New Song Debuts Online

The first song from the upcoming Michael Jackson music documentary has made its debut online.

Sony Music released "This Is It" at midnight Sunday night, on www.MichaelJackson.com.

The song plays during the closing sequence of "Michael Jackson's This Is It" and will be included on a companion two-disc CD set. The single features backup vocals by Michael's brothers, The Jacksons.

The documentary opens Oct. 28 for a two-week limited run and was built around rehearsal footage for Jackson's planned London concerts. He died in Los Angeles on June 25.

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The coroner has with his death caused by acute intoxication of the anesthetic propofol with other sedatives a contributing factor.

The CD features original album masters of some of Jackson's biggest hits, including "Thriller" and "Billie Jean." They're in the same sequence as they appear in the film.