Orchestration
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Orchestration is the study or practice of writing music for an orchestra or of adapting music composed for another medium for an orchestra. Also called "instrumentation", orchestration is the assignme
A hand-written musical score for Act 2 of the opera Der Freischütz by Carl Maria von Weber, written in the 1820s. The score contains all the parts for the singers and the accompaniment parts and melodies for the orchestra.
Arrangement
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In music, an arrangement is a musical adaptation of an existing composition. Differences from the original composition may include reharmonization, melodic paraphrasing, orchestration, or formal devel
Orchestration
…greatly on the needs and skill set of the particular composer. In musical theatre, the composer typically writes a piano/vocal score and then hires an arranger or orchestrator to create the instrumental score for the pit orchestra to play. In jazz big bands, the composer or songwriter may write a lead sheet…
John Philip Sousa's manuscript arrangement of Richard Wagner's The Flying Dutchman overture (page 25 of 37).