Which music artist's endorsement deal with Beats Electronics resulted in them receiving company equity that later translated to approximately $400-500 million when Apple acquired Beats in 2014?

The relationship between music artists and brands has evolved into a multi-billion dollar industry. From headphones to fashion lines, beverage deals to tech partnerships, musicians have become powerful brand ambassadors. This trivia question explores one of the most lucrative product endorsement deals in music history. Test your knowledge about the business side of the music industry!

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Dr. Dre
Jay-Z
Rihanna
will.i.am