Drop D Tuning 
I'm pretty sure this is right, must be played down picking, this is a killer riff from a killer band inme rock.

Part 1

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--0--10-12-0-0-12-0-12-12-0--15-12-10-12-0-0---------------]

Part 2

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-------------------------------------------------------------------------------------------------] Repeat 3 times
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-12-10-12-0-0-12-12-0-12-12-12-15-12-10-12-0-0-12-12-0-12-17-15--8-8-10-10-----------------------]