The qualifications that you need to start a career in music composition depend on your career goals and your composing skills. You may wish to pursue a degree in music theory, writing, or music performance, especially if you wish to teach at a college level. Composers often need to show their skills through a portfolio of previously-composed work. You can write and record pieces as part of a postsecondary degree program or on your own without any formal training. Most composers are also qualified as musical instrumentalists or performers.