The idea wasn't unusual: Gather a bunch of rock, pop, R&B, country and hip-hop stars for a concert highlighting an important cause — in this case, numerous instances of racial strife across the U.S.
The response from the music community, however, was anything but business as usual.
"I didn't think quite honestly we could afford another 'Kumbaya' moment," said Grammy-winning songwriter, singer and producer Pharrell Williams about the call he got to participate in a concert for unity. "That's not where the world is right now. The world needs action."