12. Justin Bieber – He may be an easy target, but phenomenal popularity aside, judging by the 16-year-old's musical output alone he deserves a place on our countdown. From the pop-R&B quagmire of his debut single 'One Time' to the slightly creepy 'Baby', Bieber's music is all ultra-glossed, over-produced fodder that's custom built by studio geniuses to infiltrate the charts. Scratch beneath the surface and there's nothing there but millions of screaming teenagers.

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