(FILES) In this file photo taken on September 13, 2018 Childish Gambino/Donald Glover attends Rihanna's 4th Annual Diamond Ball at Cipriani Wall Street in New York City.  For many artists, the Grammy awards gala is not just music's biggest night -- it is also a cultural battleground rife with criticisms that provocative black artists are systematically not getting their due. This year, that criticism could be muted -- even if momentarily -- when the Best Music Video prize is handed out.  The five nominees in the oft-overlooked category are boundary-pushing -- and they are all black. Their visual work showcases industry innovation and is rich with social commentary on Donald Trump's America. "It's the year of Trump -- the need to speak out is overwhelming," Carol Vernallis, a music scholar at Stanford University in California, told AFP. "I can imagine African-American artists feeling the need to push."Childish Gambino -- the favorite to win on February 10, 2019, according to award prediction website Gold Derby -- took the internet by storm last spring with his painfully striking viral video, "This Is America."
 / AFP / Angela Weiss / TO GO WITH AFP STORY by Maggy DONALDSON - "Best Music Video Grammy field showcases industry's cutting edge"
Donald Glover, aka Childish Gambino, stars in a just-released short film with Rihanna. AFP

Why didn't Childish Gambino attend the Grammy Awards? Because it has a long history of dissing hip hop