What is the highest grossing song of all time Happy Birthday?
What is the highest grossing song of all time Happy Birthday? Later, the 2003 documentary, The Corporation, noted that Warner charged as high as $10,000 (€9,400) for the song to appear in a film. This all made the song the highest-earning single song in history, collecting an estimated $2 million (€1.8 million) a year in licensing fees.
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