Meaning

noun a musical composition consisting of a series of songs or other musical pieces from various sources

noun a work of art that imitates the style of some previous work

originVia French pastiche, from Italian pasticcio (“pie, something blended”), from Vulgar Latin *pastīcius, from Late Latin pasta (“dough, pastry cake, paste”), from Ancient Greek παστά (pastá, “barley porridge”), from παστός (pastós, “sprinkled with salt”). Doublet of pasticcio.

Etymology from Wiktionary, CC BY-SA 3.0