So who's the bigger star: Leona Lewis or, er, Ingrid Michaelson?

It might not be the one you think. Johnny Black tells how virtual labels, games and 'synchronisation' are changing the measure of pop successIt used to be easy to tell who the big acts were. If an artist appeared regularly on Top of the Pops or lodged their releases consistently in the charts, we knew they were popular and, very probably, financially successful. That's no longer true. There are now hitmakers who appear frequently on TV, who are household names and faces, but who are not making f...

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