This paper focused on the loudness statistics of the songs, especially commercially succeeded albums of popular music in Japan during the year of 1989 to 2018. The purpose of this paper was to verify the existence of the “loudness war” in Japan. The statistical results showed there was a leap of loudness in the middle 1990s, which implies the existence of the loudness war was on in Japan. Moreover, the authors employed the time series analysis and estimated the average loudness from 2019 to 2028. The authors proposed the loudness estimation by using the ARIMA model. The model estimated the future average loudness would rise to -4 LUFS, in case of without any regulations.
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