I want to know the answer to the following question:
Which former president of Def Jam called Beyonce the greatest entertainer alive?
All the background I'm provided with is that "According to Barbara Ellen of The Guardian Beyoncé is the most in-charge female artist she's seen onstage, while Alice Jones of The Independent wrote she "takes her role as entertainer so seriously she's almost too good."". Is that enough to answer the question?
Answer: no