You can apologize to the teacher and then go to class.

Set a good example and be the first to think. Arrive at the classroom 5 minutes before class and be ready for music class. Interact with the teacher to better digest the unpleasantness of the past.

The teacher will see your sincerity and will not argue with you. As a music teacher, you can set rules and keep students at ease in the first half of the time. Once the rules are established in the first class, there will be better teaching in the future. Get twice the result with half the effort. The second half can lead to music class-related content.