Copyist
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A copyist is a person who makes written copies. The term's modern use is almost entirely confined to music copyists, who are employed by the music industry to produce parts for individual musicians from an orchestral score or composer's manuscript.
Until the 1990s, most copyists worked by hand to produce parts for individual musicians. To produce written parts, copyists used a calligraphy pen and manuscript paper. In the 1990s, copyists began using proprietary computer software packages which can produce parts from a digitally-stored full score. Scoring programs include Finale and Copyist).
Both handwritten and computer software part-preparation require a significant understanding of musical notation, music theory, the musical styles and conventions of different styles of music (e.g., regarding appropriate ornamentation), and strong attention to detail.