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PCD
Since: May, 2021
2022-05-07 22:26:08
Audience Participation Song has an example mentioning the main singer who encouraged his audience to sing— which was lampshaded by an observer suggesting the singer do so instead.
I've checked Music Tropes, but haven't yet found anything closer than this.
JMQwilleran
Since: Nov, 2011

Right before the chorus of the song, the singer indicates it's going to happen, i.e. "sing the chorus, how's it go?" in "The Real Slim Shady."