Russia is only partly in Europe but I found this piece on the history of Swan Lake being used for political announcements interesting.
https://www.newsweek.com/putin-dead-pay-attention-when-russia-starts-broadcasting-swan-lake-1707162
Is Putin Dead? Pay Attention When Russia Starts Broadcasting 'Swan Lake'
When Leonid Brezhnev died in 1982, state-run television broadcast a full-length Swan Lake in lieu of a death announcement. The same footage was aired after the deaths of Yuri Andropov in 1984 and Konstantin Chernenko in 1985. In her book Like a Bomb Going Off: Leonid Yakobson and Ballet as Resistance in Soviet Russia, Janice Ross suggests that these screenings of the Russian ballet were used as a stalling tactic, allowing Soviet leadership time to plan while "soothing the masses." Ballerinas would dance and the public would wait, calmly, applauding the screen.
The same technique was used in 1991 when communists attempted to overthrow Mikhail Gorbachev. Swan Lake aired for three days straight while the public waited it out. In 2011, the Russian national television channel Kultura aired a rebroadcast of Swan Lake to commemorate the attempted coups' 20th anniversary.
https://www.newsweek.com/putin-dead-pay-attention-when-russia-starts-broadcasting-swan-lake-1707162
Is Putin Dead? Pay Attention When Russia Starts Broadcasting 'Swan Lake'
When Leonid Brezhnev died in 1982, state-run television broadcast a full-length Swan Lake in lieu of a death announcement. The same footage was aired after the deaths of Yuri Andropov in 1984 and Konstantin Chernenko in 1985. In her book Like a Bomb Going Off: Leonid Yakobson and Ballet as Resistance in Soviet Russia, Janice Ross suggests that these screenings of the Russian ballet were used as a stalling tactic, allowing Soviet leadership time to plan while "soothing the masses." Ballerinas would dance and the public would wait, calmly, applauding the screen.
The same technique was used in 1991 when communists attempted to overthrow Mikhail Gorbachev. Swan Lake aired for three days straight while the public waited it out. In 2011, the Russian national television channel Kultura aired a rebroadcast of Swan Lake to commemorate the attempted coups' 20th anniversary.