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Shore told The Province that he has been discussing reuniting with Jackson for the two-part Hobbit adaptation since 2002.
"It looks like finally it's going to be happening," he said. "I'll be working on it for the next three years - it's going to consume a lot of my time and work now."
Shore composed the music for Jackson's fantasy trilogy - winning Oscars for Fellowship Of The Ring and Return Of The King - and worked with the director on King Kong before leaving over creative differences.
Jackson's last movie, The Lovely Bones, was scored by Brian Eno.
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