you own the song.
the track itself is probably microsoft owned, with your writing credits. essentially you'd still get the royalties, unless microsoft objected. i doubt they would, though, as it'd be a massive PR disaster.
if you wrote a song using nothing but a drum machine as backing, it'd be more or less the same thing.
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the brass moustache putting the ass moust in brache since, Fri 23 Jan 2009, 18:10,
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