Right now, maybe, but that's because he's still new and has endless radio support. He's bigger than everyone (except in terms of celebrity. He didn't even make the news on TV when he was busted with coke).
In total, Beyoncé has sold millions of more albums and sales (and yes, Destiny's Child counts).
Regarding itunes, beyonce had no new material, at that time her 4 era was long time ago done. Bruno is still on his current era, released the album a year ago+ and has a new single.
She would've finally gotten a song to #1 on iTunes again! It's been over a half a decade it seems.
oh wow has it really :\
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also food for thought, beyonce performed "End Of Time", which the GP was totally unaware of. So basically to the GP it was a new single, yet it didn't crack the top 100 after the superbowl