[horror music]How do you detune the notes of a song?

I’m having a hard time trying to detune a song from a happy major key(as attached) to twisted, minor keys when it’s reaching its last few notes. This effect happens sometimes in thrillers when the scene is being switched from peace to horror.

I tried “changing pitch” and some other possible plug-ins, but none of them work. Anyone has idea for this magical effect…? thanks!!

Please don’t double post.
You have a reply here: https://forum.audacityteam.org/t/plugin-that-detunes-tunes-up-side-down-the-vibe-of-a-song/49049/1