Cleveland Orchestra & Pierre Boulez - Le Chant du Rossignol Poeme symphonique for Orchestra: Marche chinoise

ALTERATION (from late lat. Alteratio - change) - 1) Increase or decrease in the level of DOS. scale without changing its name. Signs A . : (sharp, increase by a semitone), (flat, lower by a semitone), (double-sharp, increase by a tone), (double-flat, decrease by a tone). The signs of triple increase and decrease are not used (an exception is in Rimsky-Korsakov's “The Legend of the Invisible City of Kitezh”, figure 220). Signs A. , standing at the beginning of the musical line with the key (key), are valid in all octaves until they change. Signs A. in front of a note (random) are valid only in one octave within a given measure. Refusal of A. is designated by a sign (bekar); signs, and are outdated, and in cases where a sound increased by a tone is followed by the same sound increased by a half tone, or by a sound reduced by a tone, the same sound reduced by a half tone is then written not, a,and accordingly after not, a. Initially, the concept of A. arose in connection with the twofold outline of sound B, which had already been encountered in the 10th century.