Voices in combination.
Treating solo voices in a polyphonico-harmonic manner is the best method of preserving their individual character in ensembles. A distribution which is wholly harmonic or entirely polyphonic is seldom found. The first plan, largely used in choral writing, simplifies the movement of the voices too greatly, eliminating their melodic character; the second method is wearisome and somewhat disturbing to the ear.
As a general rule the voices are arranged according to the law of normal register. Crossing of parts is rare and should only be done with the intention of emphasising the melody in the ascending voices above those adjacent in register, e.g. the tenor part above contralto, the mezzo-soprano above the soprano, etc.