After 3 1/2 decades of work of massive albums sales, hugely lucrative tours and a host of other business ventures, Beyonce has joined a short list of musicians: The billionaires.

US singer Beyonce is now a billionaire, Forbes magazine said Monday, becoming only the fifth musician to achieve such a milestone.

Forbes estimated that the Cowboy Carter tour grossed over $400 million in ticket sales and $50 million in merchandise, with an estimated $10 million the singer earned from her series of Levi's commerc...