Duet Mood Dissonance

Alice and Bob are taking part in a duet, whether it be an original song produced for the show or an already-"established" piece used for the scene. However, while they might be performing the same song - and thus, more likely than not, singing about the same subject - how they feel about it couldn't be any more wildly different.

Despite the name, this Duet Mood Dissonance can involve a trio, quartet or more - the focal point is the difference in tone between two or more of the singers participating, which is usually accompanied by a change in instruments and key between their parts.

Compare and contrast Lyrical Dissonance, in which the lyrics themselves contrast with other aspects of the song.

Film

 * "I Remember It Well", from Gigi, crosses this trope with Rashomon Style. It's obvious that Honoré has happier memories of that day than Mamita does (not that hers are unhappy).

Theatre

 * A case occurs in "I Know Him So Well" from Chess, where Florence and Anatoly's wife both sing about how well they understand his needs and motivations... and may as well be describing two entirely different men.

Western Animation

 * In the Central Park song Can We Do Today Again?, Owen sings about how he messed up at being a father when he thought he would do well, while Paige sings about how she did even better than she thought as a mother. Where Owen wants the start the day over to have a second chance and do it right, Paige wants to relive the joy of being so awesome.
 * "Bob's Happy Place" from Bob's Burgers is a trio with only 2 of the characters on the same emotional page.
 * In the second part of "A Canterlot Wedding", the second season finale of My Little Pony: Friendship Is Magic, "This Day Aria" is sung by Chrysalis and Princess Cadance, and is about Chrysalis's evil plan to use Cadance's guise and ruin Shining Armor's happily ever after and Equestria's future. Of note is that Chrysalis and Cadence have the same voice actor.