Why Japan misses the music broadcasts of the 1970s and 80s

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It is because idol culture developed extremely rapidly from the 1970s,
and as the economy boomed, broadcasting stations competed
to present flashy stage sets, compositions, and accompaniments.
They produced spectacular stages through intense competition, providing plenty of visual entertainment,
and since it was an era of live music performances, even the same song
offered a different flavor depending on each station's arrangement.
As the Showa era (1926-1989) in the Japanese calendar came to an end,
most of these broadcasts were discontinued, making them even more memorable as iconic content of that time.
From the late 1980s, the Japanese music scene shifted
toward rock and singer-songwriters, changing the environment,
and as Emperor Hirohito became critically ill starting in the summer of 1988,
the resulting solemn social atmosphere led to a decline in broadcasting and culture overall.