From Wiktionary, the free dictionary
From passage + work.
passagework (usually uncountable, plural passageworks)
- (music) An ornamental passage in a musical work, often resembling a scale; or the performance of such a passage
1987, Harold C. Schonberg, The Great Pianists[1], →ISBN, page 189:More octaves ensue, followed by chromatic passagework with filigree scales.