Question

Which style of polyphony uses a borrowed chant and arranges several new melodies and texts above and unrelated to the chant?

Answer 1

If I'm not mistaken, it's called a motet.

Answer 2

Motet

Step-by-step explanation:

Motet is a polyphonic music genre that emerged in the 13th century, where initially different texts were used for each voice. From this feature comes the origin of the term, derived from mot, word, in French. The motet became one of the great forms of polyphonic music, being the pinnacle of its use in the 16th century modal counterpoint, despite its importance to Baroque music and its recurrence even by romantic composers.