Listening to music engages the brain and promotes creativity. It's the case with all types of music and not just classical or jazz. It also provides a powerful way to engage one's emotions while providing and cathartic outlet from everything from love to loss, grief, and anger. Musical education also needs to stay as part of high school curriculum.
When you learn something new, no matter what it is, it makes you smarter. No one is born with the ability to play music without learning something about it first, so taking the time to learn it will only make you smarter. It may help you to develop a learning style for learning other things as well.
Music opens a gate to a new world. Within that world are people, communities and cultures that are opened up to the person listening. Along with learning about other cultures, it also opens up an opportunity to use music as an educational tool - for example, putting vocabulary words into song lyrics to help children learn their meanings.
Learning how to play music develops an individual's brain activity to think more mathematically and often leads to higher scores in math and science. Research shows that listening to classical music will cause people to retain higher amounts of knowledge in both minor details as well as overall concepts for individuals.