Boy, you got me there - I do not even know what you are talking about. Popery from Christian System? Never heard of this.
There is controversy in the Church of Christ over the music issue as there are controversies in all churches.
Controversies usually occur when an individual does not like the status quo, when pride takes over, or when individuals seek to please themselves and have an enjoyable service rather than concentrate on the purpose of the service - to worship God.
Every generation has had the young want to change things and every generation has changed things. However, Christians tend to hold to their beliefs and fear when others challenge those beliefs. I doubt many church members hearing of people discarding the long held beliefs and suddenly claiming they are not correct, will easily go along with it in any church anywhere. It is human nature where beliefs are concerned. They wonder why?
Here's a lenghty discussion about the ICOC excessive "shepherding" of their members.
http://www.angelfire.com/pro/kairosfocus/resources/ICOC_response.htm