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The natural horn is the valveless forefather of the modern valved horn. The fundamental can be changed by employing interchangeable crooks of various lengths. Once the horn has been thus placed in its "key," the only pitches available are those of its harmonic series, although intonation may be adjusted by the right hand placement. Baroque tuning is approximately a half-step lower than modern concert pitch; the concert pitch the fundamental here is the E an octave below the bass clef.

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