Bebop is a style of jazz that created during the 1940s and is portrayed by ad lib, quick beats, cadenced eccentricism, and symphonious unpredictability. World War II stopped the prime of swing and saw the beginnings of bebop. Large groups started to wither as performers were sent abroad to battle
Impost: Is a projecting block resting on top of a column or embedded into a wall.
Keystone: Wedge shaped stone, generally round one at the apex of a vault.
Voussoirs: One of the wedge-shaped pieces forming a arch or vault.
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Protest art acts as an important tool to form social consciousness, create networks, operate accessibly, and be cost-effective. Social movements produce such works as the signs, banners, posters, and other printed materials used to convey a particular cause or message.
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The correct answer among all the other choice is C. Gioachino Rossini. Gioachino Rossini made great use of ostinato figures in his operas. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.