After all, high school students have to have jobs to pay for their cars and they need cars to get to work. Basically all teachers, and especially music teachers, have to understand their students needs. Finally comes music beyond just school, or music in life. There are obvious things for this too, such as music for entertainment. Music has been used for its entertainment value for a very long time and can continue to be used for nothing but entertainment.
Music is important as an industry.
Many jobs are connected to music making and teaching. Finally, without music daily life would be just flat out bland.