Over the years we've done a million and one showcases and open mics. And one of the most frustrating things used to be getting artists not to rap/sing over their vocals. Well, if you haven't heard, Jay himself made big news when he refused to continue his performance at the recent So So Def reunion concert. Apparently, it has to be the "show track" or no deal. Big-ups on that one Jay...

Checkout the video here: http://hiphopwired.com/2013/02/24/jermaine-dupri-brings-out-jay-z-at-so-so-defs-20th-anniversary-concert-video/

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