When the voices sing together the textave cujus nativitasnostra fuit solemnitas in this excerpt, Imitation best describes the texture.
In such a case , the highest voice first sings the particular melody and other voices repeat thereafter, making an entry at different intervals. The texture of this melody keeps on changing throughout.
In the second quatrain of this song, sopranos introduces the melody which is later followed by other voices, one after the other, imitating the first melody. Similarly, in the fourth quatrain, the voices sing in a texture known as homorhythmic.
In the final couplet, all four voices sing the melody together.
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