Will my prayers and supplications be accepted for the years I worked selling songs? And will I bear the sins of those who listened to the songs I sold, even after repenting and leaving this work?

As long as you have repented sincerely from this reprehensible act, then repentance erases what preceded it of sin, and "the one who repents from sin is like one who has no sin." So, your repentance erases your sin, and your past prayers and acts of worship are accepted, Allah willing. The fact that people listened to those songs does not harm you after your repentance.