Parallel octaves , the movement of two parts from octave to octave , are traditionally prohibited in four - part writing 八度平行是從八度到八度的兩聲部運(yùn)動,傳統(tǒng)上在四聲部作品中禁用。
Since the leading tone ( leading note ) generally rises to the tonic , doubling the leading note in simple four - part writing would result in doubled leading tone ( note ) followed by a doubled tonic , making the undesirable parallel octaves 導(dǎo)音通常升至主音,四聲部寫作中重奏導(dǎo)音會導(dǎo)致重奏后的導(dǎo)音后跟隨一個(gè)重奏后的主音,從而造成并不需要的八度平行。