Before the east and west coast rap beef of the 1990s boiled over with the murders of Tupac Shakur and Notorious BIG, legendary producer Quincy Jones called a secret meeting at which he appealed for an end to the violence.
As hip-hop rose from the streets to the mainstream in the 90s, the rappers and hustlers that broke through had few role models who had trodden that path before them.
There was one man, though, who had been there, and done pretty much everything.
Quincy Jones had been in gangs and had been stabbed at the age of seven in 1930s Chicago, before becoming a major force in American music thanks to his work with legends like Ray Charles, Frank Sinatra and Michael Jackson.
He was at the heart of revolutions in jazz, swing, soul, funk, disco and pop - but one aspect of his career that got less attention when he died last week at the age of 91 was his place in hip-hop.