I've had a lot of years of experience with a lot of very conservative American churchs. In my own direct experience, the most repressive attitude toward music itself that I've encountered involved a small denomination that allows singing, but with no instruments; I consider that to be regretable, and without any justification from either the Bible or any coherent Christian tradition, but at least they have a tradition of singing. There is still a minority, unfortunately not tiny, opposed to dancing. I'm sure there are "pockets" of American Christians more repressive regarding music that I haven't encountered, But the vast majority of even hidebound fundamentalists have at least rich tradions of music tailored to express their faith; the downside is that a lot of the lyric content serves as some of the most effective endoctrination of their young people.