Tim Ingham, Editor of Music Week, says he thinks the Olympic Park will be a popular venue, but it'll have its work cut out keeping its appeal after the Olympic effect dies down.
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Fallen trees, damaged power lines and emergency speed limits were today causing chaos for rail passengers.
They will be supported by artists including Zara Larsson, G-Eazy, Wiley, Sean Paul, WizKid and an exclusive set from Bryson Tiller.
Cast your mind back to your last job interview. What was the one question that really made you sweat?