oktáv
An oktáv (octave) is the musical interval between one pitch and another with exactly twice its frequency. In Western music theory, an octave is perceived as a natural equivalence class: pitches separated by an octave are considered the same note name in different registers, such as middle C and the C an octave higher.
Etymology and concept: the term derives from Latin octavus meaning "eighth." The octave spans eight diatonic
Tuning and temperaments: in an idealized simple ratio, the octave is exactly 2:1. In most modern music,
Usage and examples: octaves are foundational for melody, harmony, and instrument design. Instruments with repeating pitch
Microtonal and historical notes: some non-Western musical traditions and modern microtonal systems explore tunings where octaves
See also: interval, scale, octave equivalence, tuning.
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