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The song changes key some time earlier, and then changes back in the middle of the last chorus.
The song modulates downward before the last chorus.
Subverted: The chorus starts with an instrumental break in a different key, then changes back when the vocals come in...
Double Subverted: ...then it changes again in the middle of the chorus.
Parodied: An extreme metal band adds a conspicuous key change to the last chorus of an extremely atonal song.
Zig Zagged: Some albums by one pop artist are full of key changes, others have none to speak of.
Averted: The whole song uses the same key signature.
Enforced: A producer pressures a band to write more songs with this trope, in order to be more commercially successful.
Lampshaded: The lyrics reference the key change when it happens.
Exploited: The rest of the band, while playing a live version of the song, notice that the singer is singing at the wrong key half a step higher than usual - and then change keys with him, deciding to just go with it.
Defied: The lyrics reference the lack of key changes.
Discussed: A song has a verse about why the trope is overused.
Conversed: A songwriter and the singer he's working with talk about the merits of the trope.