Beyonce Knowles - Glastonbury Festival PerformamceBeyonce Knowles felt like a "rock star" as she closed the Glastonbury festival last night (26.06.11).The 'If I Were A Boy' singer stunned revellers by playing a number of covers during her energetic set at the world-famous music event in Somerset, South West England, as well as a collection of songs by her girl group Destiny's Child.Beyonce - the