Justin Bieber and Katy Perry live

O2 Arena; Hammersmith Apollo, both LondonIt's been a strange week for pop music. The deeply unconvincing Ke$ha was reduced to drinking fake blood from a heart onstage in Australia in a bid for some edge. A 13-year-old girl called Rebecca Black became an ironic internet meme when "Friday", her cheesy pop video made courtesy of a bespoke service called Ark Music Factory, went viral and clocked up 10m YouTube hits.Meanwhile, Justin Bieber – the most followed pop pup de nos jours – wasn't really...

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