Lyrical Dissonance is a very common theme used in numerous Vocaloid songs. In fact, it's harder to find a song, which doesn't follow this trope.
The list is sorted alphabetically by producers.
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Macaron is mysterious song with almost poetic lyrics about how singer enjoys eating macarons.
Many song from Star Girl and The Illusion Paradise series have got shade of this trope.
The trope is averted in the first half of The Nun and Idol Girl. At the beginning it is happy j-pop song about a nun, who wanted to be become an idol and thanks to the Dr. Realist her wish was granted. It didn't end well as idol got overwhelmed by insults to the point of cutting herself. And then it got much worse. The girl reminded a such thing has already happened in reality. After she call this to mind, she ran to the church with a knife to kill herself, but she was caught by a priest, who then got accidentally killed by the girl, because she forget to drop out the knife and she fatally stabbed him as consequence. She returns to be a nun and constantly pray to the God to forgive all her actions, even though she knew he won't.
Breaking Things into Pieces is happy song about a person, who have a bee in her bonnet about destroying everything, because he believes they steal soul away, when people become attached to them. It worth to add, that said things in the title don't confine only to inanimate object.
Though Owata-P rarely uses this trope, he has some songs following this theme:
This trope can be averted. Other interpretation of the song says main singer is an internet addict trying to socialize online, but his mind get slowly corrupted by it. However he finally tackled, how imperfect the virtual world is, so he decided to leave this place and start a new life in reality. Lyrics in this case are referencing to the virtual world.
Whole "Do Vocaloids Dream of Doomsday Birds?" series. Full stop. Almost every song (excluding ＊Sayonara, World End) has chiptune or video game-like melody, while lyrics are about a destruction of mankind and Earth due to war.
The most notable is ''*Hello, Planet'' sung by Hatsune Miku, being chronologically the last song in this series. It's about Miku, who wakes up after apocalypse and wanders through deserted wasteland to find his lover. Whole song ended with happy closing melody in scene, where Miku dies in front of master's grave.
Numerous songs from Happiness series. Each of them have electronic melody you could dance for, but lyrics cloak its morbid meaning.
In, "An Earnest Unrequited Love, Wanting to make it bear a little happiness": The song starts in a happy chirpy romance tune, until Mayu reveals part way that she knows everything about the guy she's crushing on and who's he's dating. Mayu then proceeds on singing about killing her rivals by physically and psychologically maiming them. In the end she decides to kill her crush as well.
Mayu's story seems to be connected to: "You're Seriously Mad? I'm not mistaken here", Where again it starts out in a lovey dovey whimsical tune, until again she sings about stalking then killing her crush, apparently dumping his body in the pool, then quietly clearing off evidence. Surprisingly! Mayu is not a Karma Houdini, because she also sings about getting caught at the start and in the end.
In, "I'm Sorry for Liking You": the tune is an uplifting romance song that is reminiscent of a comedy love genre. It doesn't turns out to be anything but that. IA apparently bought a pair of contact lenses, that can give you laser eyes. When she failed to read the manual, it gets stuck in her eyes. She panics all the while she burns everything she sees to the ground including her crush. However unlike most examples it ends in a Surprisingly Happy Ending.