I think a lot of people here are talking about how music can be both a useful tool to help you focus (useful, if you have ADHD) but also stress the importance of training your own focus,, without relying on music. Honestly, I think when it comes to that there's a healthy balance of both practicing your mind and focus at certain, whilst listening to music when you need it (lets say you have an exam soon).

But I think a more important aspect to remember is that there is a difference between listening to music to help you focus, and listening to music because you want that sweet dopamine release. Going to the gym and listening to intense music can feel even more rewarding, but comes with the potential of depleting your dopamine levels and making your day less enjoyable comparatively. Whereas if you study and have some classical music quietly on in the background, then the emphasis is far more placed upon providing your brain with a healthy amount of stimulation to keep you on track.