For me (piano player/singer and dabble in others) it’s a quick dopamine hit. I struggled most with the ‘boring’ part of training but I hyperfocused through a lot of it and my teacher thankfully new that I needed motivation through that so instead of just learning my exam pieces and technical exercises I was playing pop songs as well that I could sing along with myself etc.
The point I quit lessons was second year college with a new teacher where I spent all year on two pieces. I nearly lost my mind and never went back to lessons.
Even today I struggle to get myself to the piano but I can lose myself for hours and forget to eat or go to the bathroom and just float along on the sea of sound and dopamine 😂