40 bestselling singles of 2011 so far

Compiled by the Official Charts Company and a distant galaxy away from the critics' lists, it's the bestselling singles of the year so far, starting with: 40. Katy Perry, 'Last Friday Night (TGIF)'. K-Pez's 71st single from 'Teenage Dream' squeezes into the Top 40.

• Added: Dec 20, 2011

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