My D graduated a year ago in Vocal Performance. Many of her friends were music ed majors and ALL have jobs teaching. However they did come out of a top, selective school for music ed. I know quite a few kids from another school in our area that have also gotten teaching jobs. Again it is a school with a good reputation for music ed.
My suggestion is that you have a conversation with the music dept at your school. You’re an adult now. Go to the music dept and ask them about a music ed degree. You could even ask about a minor in music and/or opportunities to continue in computer science with participation in music. And be sure to ask them about their placement statistics for teachers. In this way, you can get some concrete information with which to make an informed decision going forward. You may find that computer science is just fine if you have an outlet to music.
Note that many people have negative opinions about music degrees. That’s unfortunate as many people are successful and happy working in music…or transitioning to another area after getting a degree in music. You definitely want to approach it with your eyes wide open…and knowing your own strengths and weaknesses in approaching a non-linear career (meaning A + B = C). Some careers do require a specific type of degree. However there are many good jobs available that only require a bachelor’s degree. In order to get a comfort level with this, I would also advise you to visit the career counseling office at your school. Knowledge is power.