Summarize this article:

The state where you wish to become certified will look at your coursework and transcripts to make sure you have fulfilled all of their requirements. You might need to take more classes before you can receive initial certification. This test will assess will test your knowledge of both core liberal arts and sciences topics and teaching skills, and you will need to pass it before you can move on. You will also need to demonstrate your master of the subject area you will be teaching. While these vary by state, there are some things you will probably need to know anywhere. Testing areas will likely include music theory, music performance, listening skills, and music history and culture. Questions will likely be a combination of multiple-choice and essay format.

Summary:
Fulfill any requirements that you did not complete during your coursework. Take the general teacher certification exam. Take the music subject area certification exam.