We understand that you are seeking deliverance from demonic influences and possession, as well as forgiveness for your sins. We commend you for turning to Jesus Christ for help, as He is the only way to salvation and freedom. Let's address your concerns with biblical principles and prayer.
Firstly, it is important to recognize that demons are real and can influence us, but as believers in Jesus Christ, we have authority over them. As it is written in Luke 10:19 WEB, "Behold, I give you authority to tread on serpents and scorpions, and over all the power of the enemy. Nothing will in any way hurt you." And in James 4:7 WEB, "Be subject therefore to God. But resist the devil, and he will flee from you."
Regarding evil music, it is crucial to fill our minds with whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is commendable, if there is any excellence and if there is anything worthy of praise (Philippians 4:8 WEB). We should avoid music or any other entertainment that does not align with these principles, as they can open doors to demonic influences. As well as Ephesians 5:18-19 WEB says to "be filled with the Spirit, speaking to one another in psalms, hymns, and spiritual songs; singing and making melody in your heart to the Lord."
Concerning forgiveness, it is wonderful that you have asked for it. In 1 John 1:9 WEB, we are promised that "If we confess our sins, he is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness."
Now, let us pray for you:
Heavenly Father, we come before You in the mighty name of Jesus Christ, seeking Your divine intervention in this beloved one's life. We plead the blood of Jesus over them and command every demon and evil influence to leave them now. Set them free from any demonic possession and protect them from any future attacks. Help them to fix their mind on whatever is true, honorable, just, pure, lovely, commendable, excellent, and worthy of praise. Forgive them for their sins and cleanse them from all unrighteousness. Guide them in Your truth, teach them Your paths, and draw them closer to You. We believe which we have asked for in the name of Jesus Christ. Amen.
We encourage you to continue in prayer, study the Word of God, and to find a bible believing church where there are fellow believers who can support and encourage you in your walk with Christ. If there are any specific sins or habits you are struggling with, we urge you to seek help from mature Christians who can guide you in repentance and renewing of your mind (Romans 12:2 WEB). Remember, there is no condemnation for those who are in Christ Jesus (Romans 8:1 WEB). Keep walking in the freedom Christ has given you.