This is probably bass, but I'll tab it anyway. 
 
Tunned to E 
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--0-2-0-2-0-2-0-2-0-/7-7---------- 
 
 
or, 
Tunned to E, drop D 
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--2-4-2-4-2-4-2-4-2-/9-9---------- 
--2-4-2-4-2-4-2-4-2-/9-9---------- 
--2-4-2-4-2-4-2-4-2-/9-9----------