Question: What is the genre of music that the nine member group containing Nayeon, Jeongyeon, Momo, Sana, Jihyo, Mina, Dahyun, Chaeyoung, and Tzuyu called?
Sentence (from "Double affine braid group"): In mathematics, a double affine braid group is a group containing the braid group of an affine Weyl group.
Relevant evidence: No