In music, instrumentation is the particular combination of musical instruments employed in a composition, and the properties of those instruments individually. Instrumentation is sometimes used as a synonym for orchestration. This juxtaposition of the two terms was first made in 1843 by Hector Berlioz in his Grand traitΓ© d'instrumentation et d'orchestration modernes, and various attempts have since been made to differentiate them. Instrumentation is a more general term referring to an orchestrator's, composer's or arranger's selection of instruments in varying combinations, or even a choice made by the performers for a particular performance, as opposed to the narrower sense of orchestration, which is the act of scoring for orchestra a work originally written for a solo instrument or smaller group of instruments.