Glastonbury Music Festival in 2011.The Single Ladies hitmaker, 38, made her debut at one of the world's biggest live music events nine years ago and she is back as a Glastonbury 2020 headliner, thanks to the virtual line-up put together by the BBC.Beyoncé's 90-minute 2011 headline set list was made up of a mixture of her own solo hits and some fan-favourites from her time in Destiny's Child, in a medley which also gave a nod to Lady Gaga as she perfumed their pop duet Telephone.Speaking to a sea of screaming fans crammed in front of the main Pyramid stage, Beyoncé said: "I want you all to know right now you are witnessing my dream."I always wanted to be a rock star and tonight we are all rock stars...