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Zimmer posted the track "Aurora" on his Facebook page Friday. Zimmer said he recorded the song in London in the days after the theater shooting last week. All proceeds are being donated to a fund for victims of the shooting that killed 12 people.
The 8½-minute song is being sold for donations from 10 cents to $2,500.
Zimmer has scored all three films in Christopher Nolan's Batman trilogy.
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