Sitting alone just listening to music is how I am able to enjoy all the details and nuances of a great piece of music. I'm a little bit disturbed that you seem to consider it an unhealthy activity.

I also enjoy listening to music while driving or doing the dishes or hanging laundry. I also enjoy going to concerts and experiencing great musicians live.

Both those are all different contexts, different ways of enjoying the music.

To fully immerse myself, dedicated distraction-free listening is required.

And I think it's healthy to break away from the constant distractions of modern life and just listen for an hour or so.