my spell would be called villlagist inconcertom

it would make any foe i cast it upon in unable to complete any other task till they sing all of Y-M-C-A from the village people ( hand movements included) furthermore the spell has a side effect anytime the person hears or says any word that is in the song they have to start singing it and the only way for the side effect to go away is for the original caster to remove the spell