Yes. Music helps students relax.
No. Music is very distracting.
have to be regulated in some way, maybe like airplanes except students can have their own playlist or just classical. Best would be if teachers had an off button.
If it helps them
Depends on the type of music.
If you can multi-task and focus then yes why not.
If it works for you go for it but I myself find music distracting I take this to be a personal question, although the wording is a bit confusing...