Watch Michael Jackson's new song, This Is It, accompanied by video footage from the forthcoming movie. Courtesy Sony Music Entertainment
By Ian Youngs
Music reporter, BBC News
A "new" Michael Jackson track unveiled this week will not be a chart hit because it will not be available to download as an individual track.
This Is It was written in 1983 by Jackson and Paul Anka and features Jackson's brothers on backing vocals.
It had been described as "a single" in publicity material but fans will not be able to buy it on its own.
Instead, it will only be available if bought as part of a full album or a six-track EP from 26 October.
A statement from Apple's iTunes said: "We look forward to offering the new Michael Jackson album, as well as a digital-only EP with six previously unreleased tracks, providing fans a great way to get all of the new songs.
"The iTunes Store will offer the album-only single This Is It on both the album and EP."
The song had been tipped to be the first new Michael Jackson song to be a hit since One More Chance in 2003.
But record label Sony hopes its strategy will encourage more fans to buy the full album or EP.
The double album will feature 14 greatest hits, two versions of the new song, three previously unreleased demos of classic tracks and a spoken word poem called Planet Earth.
The EP will just include the two versions of This Is It, the demos and the poem.
The new song will also feature in the closing credits of a film, also called This Is It, which has been made using footage of rehearsals for the O2 concerts, due to be released in cinemas on 28 October.
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