If someone like that were starting to create music that really had elements of goodness, truth, and beauty - something actually worth listening to - then it would probably mean that some grace of conversion were working in him! It really does depend upon the thing itself, and not the creator. If the creator is inserting his own corruption into the work in a concrete way, then that is when it would be something to avoid.

This actually falls under, "Love the sinner, hate the sin." If something is sinful in itself we ought to avoid it. That does not mean that we need to treat sinners as if they were lepers, and treat every single thing they ever do or create or have contact with as if it were contaminated by leprosy.

When Jesus ate with sinners, the food was likely made by people with bad lives and bad views. When He let the Magdalen pour her perfume on his feet, He likely was aware that it had been bought with money sinfully gained. If the objects themselves are not bad, then they are not something we need to fear. "Not that which goeth into the mouth defileth a man: but what cometh out of the mouth, this defileth a man." Matt 15:11