Beyoncé and Jay-Z have once again proven that they are a musical force to be reckoned with. The couple — who began their romantic relationship in 2001 and married in 2008 — have worked together since the early days of their careers. After breaking away from Destiny's Child, Beyoncé joined the Brooklyn rapper for his smash hit, "'03 Bonnie & Clyde," in 2002. That following year, Jay-Z hopped on Beyoncé's first solo song, "Crazy in Love," and it became an instant success. The track peaked at No. 1 on the Billboard Hot 100 chart and has since been certified as a six-time multi-platinum single with over 6 million units sold.