Jay-Z wants Beyoncé and Taylor Swift to duet. The Empire State of Mind hitmaker is reportedly keen for his wife and the Shake It Off singer to collaborate on a new track and treated their attendance at her birthday party as a 'business meeting'.

A source revealed: "Taylor Swift's birthday was not just a fun

celebration, it was also a business meeting for her, Jay-Z, Beyoncé and Justin Timberlake. Name me four other people that are more powerful in the music world right now. Jay-Z is obviously aware of this and he is the ultimate businessman."

The 45-year-old rapper and music producer wants to use Taylor's "powerhouse" status to develop his brand.

The source continued to HollywoodLife.com: "He knows that Taylor is an extreme powerhouse. He has told Taylor his ideas - he wants to do music with her, and he also wants her to do music with Beyoncé. Jay-Z wants her brand to go in with him for other business ventures as well. If those four walk into a room, who is going to say no to them? Nobody! Jay-Z is a mogul, he wants to make the most out of their friendship and business relationship and make the Mount Rushmore of music!"