Pick the key stamped on the cover plate. The small label shows the pitch of hole 1 blow.
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Notes use scientific pitch notation: C4 is middle C, and the number goes up at each C, so the 1-hole and 4-hole C on a C harp are C4 and C5. Tab: 4 = blow hole 4, −4 = draw hole 4, −3' = 3 draw bent down a half step.