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In page Double bass:

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Some contemporary composers specify highly specialized scordatura (intentionally changing the tuning of the open strings). Changing the pitch of the open strings makes different notes available as pedal points and harmonics. Berio, for example, asks the player to tune their strings E1–G1–D2–G2 in Sequenza XIVb and Scelsi asks for both F1–A1–D2–E2 and F1–A1–F2–E2 in Nuits.[citation needed]