I support the importance of children study music, art, and sports at school. Most of the parents work all day that means the children remain at school more time than home. So instead have more classes like grammar the children can experience the challenge of learning a new instrument, sport or art.
First of all, studies show that children who have contact with this class are more successful than others without the contact with this areas.
Secondly, the children who experience art, music and sports class active different area of their brain that challenge themselves a different form of thinking. Also, the sports and art the experience like work in a group or have frustration to not win is good so they can grow and be mature about their feeling.