That's a bunch of bologna. I have known so-called Apostolics that have sung the power of God down in church while committing fornication and all types of unrighteous acts outside of church. It had nothing to do with the singer, but it had a whole lot to do with the person listening and responding to the music and words in their relationship with God. I realized a long time back that what I can handle as a Christian does not always relate to someone else. What you see as sinful and damaging to your walk with God develops your convictions.
Convictions are tricky.
They are developed from experience, background, and upbringing and cannot necessarily apply to everyone. Music serves so many purposes. Even in the Bible music had many purposes. It served as worship, education, edification, and evangelism. You will also find in Psalms and the Song of Solomon that it shares experiences, instruction, and examples.