The thing with spells is they wear off too fast. The magic doesn't last like it used to, it took so much power to make the magic dance.
Jareth the Goblin King knew what he needed. A star. A dying star would work best, but a live one would do. A unicorn's tail. A hobbit's left pinky toe, fresh. Not freeze dried. And one dead newt.
Crushed together. Never add water. A touch of goblin saliva if it's too dry. Store in a glass, air tight container. Preferably with a cork stopper. And there you have it. Dance Magic Dance!