Nickelodeon
https://en.wikipedia.org/wiki/Nickelodeon_(movie_theater)
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For unknown reasons, in 1949 the lyricist of a popular song "Music! Music! Music!" incorporated the refrain
"Put another nickel in, in the nickelodeon…",
evidently referring to either a jukebox or a mechanical musical instrument such as a coin-operated player piano or orchestrion. The meaning of the word has been muddied ever since.
In fact, when it was current in the early 20th century, it was used only to refer to a small five-cent theater and not to any coin-in-the-slot machine, including amusement arcade motion-picture viewers such as the Kinetoscope and Mutoscope.[improper synthesis?]
The earliest films had been shown in "peep show" machines or projected in vaudeville theaters as one of the otherwise live acts.
Nickelodeons drastically altered film exhibition practices and the leisure-time habits of a large segment of the American public. Although they were characterized by continuous performances of a selection of short films, added attractions such as illustrated songs were sometimes an important feature.
Regarded as disreputable and dangerous by some civic groups and municipal agencies, crude, ill-ventilated nickelodeons with hard wooden seats were outmoded as longer films became common
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infrastructure?