All the way back in 1989, most of the rap artists who were nominated for the (at the time) "new" category boycotted because the award would not be presented during the broadcast. Well twenty-one years later, the rap-music hatred continues. Before the show even started last night, multiple awards in rap categories were given out (therefore not televised).
These pre-announced awards included such big categories as 'Best rap Performance by Duo/Group' ("Crack A Bottle" by Eminem, Dr Dre, 50 Cent), 'Best Rap Solo Performance' ("D.O.A." Death Of Autotune by Jay-Z), 'Best Rap Song' ("Run This Town" by Jay-Z, Rihanna, Kanye West) and even the biggest, the 'Best Rap Album' award, which given to Eminem for "Relapse." Even The-Dream was disrespected. After he won for his work on Beyoncé’s single, his acceptance speech was cut short by the orchestra.
All in all, the Grammy Awards are not for "music" they are for "music minus rap."
The-Dream – Gets Cut Off During speech At Grammy Awards