Arrival is the runner up - also a fantastic movie, and the soundtrack was a masterpiece. One of the best sound tracks of all time. Terrible shame about the composer.
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I know quite a few film composers but I have never heard of Arthur Kempel. I noticed he was only 58 when he died.
I'm afraid you're confused: Jóhann Jóhannsson was the composer of Arrival, and he was only 48.