"As a sinner bows his head to pray, can’t you hear the Father say...A sinner is saved, saved from the fire" --"The Value of one"
How do saved people sing that song? In my opinion saved people actually do not, it is lost people that sing it. I say that on the basis of "out of the abundance of the heart the mouth speaketh" (Matt. 12:34). If someone sings that a sinner is saved by bowing his head to pray, then that is probably what they believe ("I believed, and therefore have I spoken" 2 Cor. 4:13).
"Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord."
"I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel: Which is not another; but there be some that trouble you, and would pervert the gospel of Christ. But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed." (Gal. 1:6-8)