What are the consequences for someone who had a role in spreading songs and videos that contain artistic content, and does he bear the sin of everyone who listened to or watched them, and what must he do to expiate for that?

Whoever sets a bad precedent for others in sin bears the burden of his sin and the sin of those who follow him in it. Among the proofs for this are the hadith: "Whoever introduces a good practice in Islam..." and the hadith: "There is no soul unjustly killed but a share of its blood is upon the first son of Adam, for he was the first to institute killing." Therefore, what you have published of tapes must be collected and destroyed. We hope you will expiate what has passed through sincere repentance and by increasing good deeds.