Rihanna's ex apparently cut morning of show
'Death Of Auto-Tune' attacks studio-enhanced pop stars
Rapper's next effort set for September release
P Diddy, 50 Cent also named most influential hip-hoppers
New deal comes a week after Def Jam departure
West is on production duties for new album
The rap star leaves label where he once served as president
Ciara will open on the July outing
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