Which music artist's endorsement deal is credited with transforming celebrity partnerships by including equity ownership in the company rather than just a traditional payment?

Music artists have partnered with brands for decades, but some endorsement deals have fundamentally changed both the music and product marketing industries. These collaborations can boost artist income beyond record sales while giving brands authentic cultural relevance. How well do you know the history of these groundbreaking partnerships that influenced how musicians monetize their personal brands?

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50 Cent with Vitamin Water (Glacéau)
Beyoncé with Pepsi
Michael Jackson with Pepsi
Taylor Swift with Diet Coke