Composed by John Williams for Harry Potter and the Philosopher's Stone in 2001, Hedwig's Theme became the musical signature of the whole film series and one of the most recognisable movie themes in the world. Its celesta-led melody accompanied Harry's owl and the wider wizarding world, and it returned across later films, trailers, concerts and theme parks. Online, the short opening is now used as shorthand for magic itself, instantly telling viewers that something fantastical, mysterious or Hogwarts-inspired is about to happen.