Music composition in music research is primarily used to analyze existing musical works in order to gain insights into their structure, form, and content.

Timbre analysis is not commonly used in music composition for research purposes, as it focuses on the perceptual qualities of sound rather than the structural elements of music.

Variation is the term used to describe the process of creating a new musical work based on an existing one, typically by altering the melody, harmony, or rhythm.

Music history is not a common application of music composition in research, as it focuses on the study of historical musical events and trends rather than the creation or analysis of new musical works.

Program music is the term used to describe the use of music to convey a specific message or emotion, often through the use of descriptive titles or programmatic elements.

Opera is not a common form of music composition used in research, as it is typically associated with theatrical performances rather than academic studies.

Ethnomusicology is the term used to describe the study of the relationship between music and other disciplines, such as anthropology, sociology, and history.

Rondo is not a common technique used in music composition for research purposes, as it is typically associated with light, entertaining music rather than academic studies.

Incidental music is the term used to describe the use of music to create a specific atmosphere or mood, often in conjunction with a play, film, or other dramatic work.

Music history is not a common application of music composition in research, as it focuses on the study of historical musical events and trends rather than the creation or analysis of new musical works.

Music cognition is the term used to describe the study of the relationship between music and the brain, including how music is perceived, processed, and produced.

Impressionism is not a common technique used in music composition for research purposes, as it is typically associated with the late 19th and early 20th century musical movement rather than academic studies.

Film music is the term used to describe the use of music to create a sense of place or time, often in conjunction with a film or other visual medium.

Music history is not a common application of music composition in research, as it focuses on the study of historical musical events and trends rather than the creation or analysis of new musical works.

Ethnomusicology is the term used to describe the study of the relationship between music and culture, including the role of music in different societies and communities.