Which artist partnership is widely credited with revolutionizing celebrity endorsement deals in the music industry by securing an equity stake rather than a traditional flat fee?

The relationship between musicians and brands has evolved dramatically in recent decades. While endorsement deals once focused primarily on instrument manufacturers and music gear, today's artists negotiate complex partnerships across fashion, technology, beverages, and more. These collaborations now often include equity stakes, signature product lines, and creative input - transforming artists from mere promotional faces to influential business partners. How well do you know the history of these game-changing music endorsements?

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Dr. Dre with Beats Electronics (2006)
Taylor Swift with Diet Coke (2013)
Justin Timberlake with McDonald's (2003)
Beyoncé with Pepsi (2012)