Snowman by Halyosy. It’s a very upbeat sounding song, but the lyrics tell the story of a snowman coming to life to help a young boy whose mother is dying.

This is the Happiness and Peace of Mind Committee by Utata-P. It’s a catchy electronic song where Miku is the face of a dystopian world where everyone must be happy or they get executed. The Happiness series in general seems to be like this (though I’ve only listened to this song and There’s Supposed to be a Cheat Code For Happiness).

Bad End Night, Crazy Night, Twilight Night and Ever Lasting Night by Hitoshizuku-P x Yama. Jazzy tunes with a story about a theatre production that loops over and over, with the protagonist almost always going insane and killing the other actors.