I have a music addiction
Why do you think you're addicted to music?
When I listen to good music, my heart swells with joy and I just listen for hours on end.
While it isn't good to overindulge in any one particular thing, listening to music is soothing and good for lifting your spirits. It's normal to feel joy listening to music. As long as you aren't spending all your time doing it, it is a fine hobby to have.
It's hard to keep at bay. I want to do it often.
Just be sure that you are living a balanced life. While it is great that you love music so much, try not to allow it to keep you from spending time with those you care about, or neglect your health.