They all pounded the floor of the barn in old-fashioned square dances, swinging their partners, skipping, laughing, under the incantations of Del Snafflin the barber, who fiddled and called the figures.
There are no more uses of "incantation" in the book.
Show samples from other sources
She believes in the power of magical incantations.
Harry Potter says the incantation, "expecto patronum" as he focuses on a happy memory to summon protection from dark magic.