What is the actual (or your) definition of Music and how does rock/metal not fall under that definition?
As far as I am concerned music is art and a lot of times when it comes to art there are no rules. Maybe the screaming vocals is too much for you (and a lot of people for that matter) but the guitars still play notes and chords and the drummers are usually the most talented drummers on earth still using time scales, separation and rhythm.
Please explain how just because you don’t like something, based on your education it is not music.
Also, Country music sucks!