FLASH AND JUMPSCARE WARNING!!! REPLACE "all sprites in this project by bobisonscratch" with "Original Sprites by bobisonscratch." Then credit yourself! Double-click flag so that the music syncs! You can replace characters by going into their costumes and replacing the poses with your characters' poses. You can also change some of the animation code if you want it to look different.
A super good CatNap mod, I don't have a link for it. So just look up FNF NightMare Fuel on Youtube! At one point H. H. will not sing to a rhythm and I can't really do anything about it, sorry. And sometimes the swap character singing isn't synced well. Took 2 1/2 Days. And only watched the mod once...