Final answer:
The phonograph was the technological innovation that popularized music during the late 1800s.
Step-by-step explanation:
The technological innovation that popularized music during the late 1800s was the phonograph. Invented by Thomas Edison in 1877, the phonograph allowed for the recording and playback of sound, including music. This innovation revolutionized the music industry, as it enabled people to listen to music at their convenience, expanding the reach and popularity of music.
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