DMA stands for Doctor of Musical Arts. A DMA degree is awarded for high attainments in the practice of music, with emphasis on the arts of performing. It's best for musicians seeking a doctoral degree that wish to waive the written thesis requirement in favor of a more creative thesis.
DMus stands for Doctor of Music. A DMus degree is usually aimed at outstanding performers and composers who wish to explore research questions arising directly from their artistic practice.
Ph.D. stands for Doctor of Philosophy. In a Ph.D., a written thesis is an essential requirement for obtaining the degree. It is best for musicians who want to seriously pursue studies in the highest terminal degree possible
Please note that Ph.D. DMus, and DMA are the university's highest degrees.