I have seen people comment on "precision obedience." One preacher said, "God does not expect us to be able to conquer sin or be perfect, so he gave us the perfect acts of worship, and how to perform them perfectly. Thus those who use instruments in music are of their father the devil."

Consider what God said. "[God] also made us sufficient as servants of a new covenant; not of the letter, but of the Spirit. For the letter kills, but the Spirit gives life." (2 Cor 3:6)

Jesus, when declaring how His disciples would be known, did not say, "By this will all men know you're My disciples: if you have the correct doctrine about worship services, in the correct way, being set aside by a lack of pianos." Rather He said, "By this all people will know that you are my disciples, if you have love for one another.” (John 13:25). Thus, "you were called to freedom, brothers...For the whole law is fulfilled in one word: “You shall love your neighbor as yourself.” (Gal 5:13-14)