Rotoscoping is an animation technique that animators use to trace over motion picture footage, frame by frame, to produce realistic action. ... This device was eventually replaced by computers, but the process is still called rotoscoping.
Answer: As the middle class grew, people became more interested in music as entertainment. Fortunately the availability of music and musical theory was more prevalent because of the invention of the printing press (Gutenberg). The arguably biggest change was the increased popularity of what is now known as polyphony.
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