I want to know the answer to the following question:
Beyoncé was the first female singer to headline what at the 2011 Glastonbury Festival?
All the background I'm provided with is that "Later that year she became the first solo female artist to headline the main Pyramid stage at the 2011 Glastonbury Festival in over twenty years, and was named the highest-paid performer in the world per minute.". Is that enough to answer the question?