Drop C tuning

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-4-4-----4-4---------7-7---------:-4-4-----4-4---------7-7---------:
-2-2-5-5-2-2-5-5-4-4-5-5-8-8-4-4-:-2-2-5-5-2-2-5-5-4-4-5-5-8-8-4-4-:
-----3-3-----3-3-2-2-----5-5-2-2-:-----3-3-----3-3-2-2-----5-5-2-2-: