The only obvious sign of salvation is the repentance, the changed heart, the changed behaviors from the working of the Holy Spirit. A person that is accepting of the promptings of the Holy Spirit will not remain in sin. However, it does seem to be possible for a person to be saved and still willfully disobedient...which is why we can never judge another person's salvation. HOWEVER, we are given both the right and responsibility to judge the actions of others, which is why I would never purchase any music or other material from a sinning believer...and would support the actions of a church to discipline and disciple a sinning believer in an attempt to bring them back within God's Will. We are, after all, our brother's keepers.