Answer:
Because it enhances the students' learning ability, their interest in the subject and it is way more connected to daily life reality.
Step-by-step explanation:
Basically, because life is interdisciplinary, only at school we have segments in the knowledge.
Besides, in a more accurate way, since dance, music and physical education evolve other aspects of the daily life as sports, culture, tradition, leisure, fun, the interdisciplinary connectivity helps the student to learn in a more solid and consistent way by increasing his interest and creating/ making those relationships visible between each of these subjects(music, dance, physical education), that are in fact intertwined.