David Allsup liked it

“Cantis: Aim this spell at someone and cause them to start singing uncontrollably. Avoid using on teenage girls unless you want to hear that Frozen song for the 11 billionth time. You just watch. In a few years that’s all they’re gonna be singing at karaoke night.”
― Sadler Mars, Harry Potter Spell and Potions Book: The Unofficial Book of Magic Spells and Potions