My bad. it's the church of Christ denomination.
WHY DON’T YOU USE MUSIC IN YOUR WORSHIP?”
We do use music, but we don’t use musical instruments to accompany our singing. While many of our friends in other churches (even some Churches of Christ) use instruments, most of our congregations don’t for several simple reasons.
Early Christianity included two groups of people: Jews with a background of instrumental music (see Psalm 150) and pagan Gentiles who also worshipped with musical instruments. Yet when the church was established in about 33 A.D., those early Christians worshipped without such instruments.
According to Dr. F.W Mattox, a scholar of early church history, musical instruments weren’t used until the fifth century, and organ music didn’t become part of Christian worship until the eighth century. Even today the majority of Christian groups worldwide still sing without instruments, or acappella (literally meaning of the chapel or in the way of the church.)
So it seems logical, considering our goal of restoring a New Testament type Christian worship, that acappella singing would fit that model. Besides, the only musical instrument God ever created is the human voice; man created all the rest. Perhaps the purest form of musical worship on earth is found in human voices.