What is the Harmony Spell from Sabrina the teenage witch?

Answer 1

The "harmony spell" on Sabrina was sprinkled on the food and served to her guests, Aaron, Harvey, and Aaron's Parents, in order to try and get them to get along. What the spell does is make them sing in harmony not really make them get along with each other, which is the morale of the story... You can't use magic to make people like each other.

Answer 2

The Harmony Spell that Sabrina Spellman casts is "My guests are angry as can be bring this night some harmony" and this spell causes salt to appear at which point Sabrina sprinkles the salt into food and other beings have to eat the food that has the salt on it in order to be infected by the spell due to it being a Harmony Spell however the spell ends up turning everyone under the effects of the spell into a musical performer.