Jimmy Buffett's hit song "Margaritaville" is more than just a catchy tune -- it's a business empire. Buffett's Margaritaville Enterprises is believed to have revenue of more than $100 million a year, selling rum, blenders, beachware and furniture, in addition to running holiday and retail getaways. The song is now "worth far more than Happy Birthday," says intellectual property expert Robert Brauneis. "I can't think of another example of a song that has that total impact."

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