Octave |

from lat. octava – eighth

1) The eighth degree of diatonic scale.

2) The lowest in height of the overtones (overtones) that make up each sound; according to the number of oscillations refers to the main. the sound of the natural scale as 2:1. Since the main the tone is conditionally referred to as the first overtone, the octave overtone, respectively, is considered the second.

3) Part of the music. scale, which includes all basic. steps: do, re, mi, fa, salt, la, si, or twelve chromatic semitones. gamma.

All music. the scale is divided into seven full and two incomplete O. They are arranged from bottom to top in the following order: subcontroc-tava (three upper sounds A2, B2, H2), counteroctave, large O., small O., first O., second O., third O., fourth O., fifth O. (one lower sound – C5).

4) An interval covering 8 diatonic steps. scale and six whole tones. O. is one of the pure diatonic. intervals; acoustically is a very perfect consonance. It is designated as pure 8. The octave turns into pure prima (pure 1); can be increased and decreased according to the general rule of alteration of intervals; serves as the basis for the formation of compound intervals (wider than an octave). O. is often used to double the sounds of a melody in order to give the sound more fullness and expressiveness, as well as to double the harmonics. votes, predominately bass part. To the choir practice, low basses (bass profundo), called octavists (see Bass), are entrusted with the performance of the sounds of the bass part doubled into the lower octave.

Octave passages are especially characteristic of the virtuoso pianoforte. music. Octave doublings are also found in music. prod. for other instruments. Various forms of parallel movement in octaves are used as technical. admission for educational purposes. See Diatonic scale, Natural scale, Interval.

V. A. Vakhromeev