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That doesn't really fit. They are saying they are breaking up but are happy to be breaking up since it was a bad relationship.
Yeah, Lyrical Dissonance would be sad lyrics about a breakup set to happy music. This question is about songs where the lyrics are happy because the singer says the breakup was a good thing.
I don't think there's a trope specifically about songs, but there could be examples under Amicable Exes.
I didn't write any of that.
Is there a trope for a Break-Up Song where the singer is somewhat happy about it. Example: Crowded House- Don't Dream It's Over.