Bass guitar is the answer to everything
View post (Does Heavy Metal have much theory into it?)
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Kirk Hammet (hes the lead guitar player in metallica. for those that dont know?) Anyways he knows how to play classical guitar. And James Hatfield (the rhythm guitarist of metallica) he knows how to play blues. Im assuming that this would mean the this particullar band does know, and incorporate music theory. You can see them play these styles on a 2 video box set of making the black album and the black album tour.