Polyphonic best describes the texture of the instrumental accompaniment in the fourth movement of Wachet auf.
More about polyphony:
Contrary to a musical texture with just one voice, monophony, or a texture with one dominant melodic voice accompanied by chords, homophony, polyphony is a form of musical texture made up of two or more simultaneous lines of independent melody.
The term "polyphony" is typically used to describe music from the late Middle Ages and Renaissance in the Western musical heritage.
The term polyphony is also sometimes used more broadly, to describe any musical texture that is not monophonic. Such a perspective considers homophony as a sub-type of polyphony
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