Will the person who provided a download program to someone who downloaded songs with it be held accountable for the sin of the songs that were downloaded?

You are a partner in every sin of listening to music due to your assistance to him, and Allah has forbidden cooperation in sin and aggression. Singing is a sin, and it is not permissible to assist in it. Therefore, you must repent, seek forgiveness, and strive to retrieve the program you gave him. Sincere repentance expiates sins.