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The track, called 'Under Control', appeared on the web this morning.
Lyrics to the number include: "I'm so cool without you here/ I don't need no stress get-cha out of here/ I'm burning up, burning up.../ Turn it up, Turn in up/ I g-got it under control."
The former Sugababe has been working on her solo debut since being ousted from the group in September 2009.
The leak marks the second track from Buchanan's solo project to surface online, after the song 'Fearless' appeared on a producer's MySpace profile page last year.
> Keisha Buchanan: 'Album will shock'
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