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This video demonstrates how to create hard rock/metal riffs, and how to develop them with the drum groove. THE tuning I used here is drop D, although you can find both drop D and drop C versions of the guitar pro file on the link below:
https://mega.nz/#F!m0ERXaoK!akq1xfQ_H...
If you have any questions, feel free to let me know, I'll be glad to answer. Cheers.