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In Harry Potter and the Half-Blood Prince: A Very Frosty Christmas, there is a scene where they have the radio on. Celestina is singing this famous song "A Cauldron Full of Hot, Strong Love", which Molly loves but Fleur Delacour hates.
I was wondering if that was recorded, or if Celestina Warbeck is singing live. If it is recorded, is it known how wizards do that, and how they save the recording?