question: Beyonce became the first female artist to perform solo in 20 years at which stage ?
answer: the 2011 Glastonbury Festival
turker_answer: Beyonce became the first female artist to perform solo in 20 years at the 2011 Glastonbury Festival .
rule-based: Beyonce became the first female artist to perform solo in 20 years at the 2011 Glastonbury Festival .