Orchestration refers to . the use of dynamics. the use of dynamics. a soloist. a soloist. a choir. a choir. what instruments are used.

Orchestration refers to the arrangement or composition of music for instruments, particularly an orchestra, and the assignment of different musical parts to the various instruments, sections, or performers. It involves decisions about what instruments are used, and about the specific notes and dynamics they will play or sing. The orchestrator or composer determines how to use the different timbres and capabilities of instruments to achieve a desired overall sound.

Orchestration does not solely refer to the use of dynamics, a soloist, or a choir, although those elements can be involved in the process:

- The use of dynamics: In orchestration, dynamics are used to indicate the varying levels of volume at which the music should be played by the different instruments or sections, from very soft to very loud.

- A soloist: While a soloist may be featured in an orchestral piece, orchestration itself is not defined by the presence of a soloist. It pertains to arranging music for an ensemble.

- A choir: A choir may be included in an orchestral work, and in such cases, the orchestration would also involve arranging the vocal parts for the choir, but orchestration is not limited to the arrangement of vocal ensembles.

In summary, orchestration is the practice of designing a musical piece for an ensemble, determining which instruments will play which notes, how they will interact, and how the ensemble will dynamically shape the overall delivery of the music, whether it includes a choir, soloists, or a combination of instrumental forces.