I want to know the answer to the following question:
In the modern day, what broad religious group is most known to implement a cappella?
All the background I'm provided with is that "Present-day Christian religious bodies known for conducting their worship services without musical accompaniment include some Presbyterian churches devoted to the regulative principle of worship, Old Regular Baptists, Primitive Baptists, Plymouth Brethren, Churches of Christ, the Old German Baptist Brethren, Doukhobors the Byzantine Rite and the Amish, Old Order Mennonites and Conservative Mennonites.". Is that enough to answer the question?
Answer: yes