 The pedagogical advantage of the movable-Do system is its ability to assist in the theoretical understanding of music; because a tonic is established and then sung in comparison to, the student infers melodic and chordal implications through his or her singing.Thus, while fixed-do is more applicable to instrumentalists, movable-do is more applicable to theorists and, arguably, composers.Movable do is frequently employed in Australia, China, Japan (with 5th being so, and 7th being si), Ireland, the United Kingdom, the United States, Hong Kong, and English-speaking Canada.