Ok, this song is pretty repetative, so it shouldn't be hard.
Intro
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------9---9---9----------9---9---9--------|
---7----7---7---7-7----7---7---7---7------|
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[ Tab from: https://www.guitartabs.cc/tabs/o/olympia/120_hours_tab.html ]
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---12-12h10-10h9-9h8-7--------------------|
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------------------------------------------| x2
---10-10h8---8h7-7h7-5--------------------|
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Then from then on he just plays the chords G, D, and E power chord in different patterns.
