One of the channels in question is “ What is ?,” which features light-hearted jazz hip-hop instrumental videos all around an hour long.

While he’s creating the future of hip-hop with his Command Central course, DJ Jazzy Jeff remembered the genre’s legends came together ‘for the culture’ at the Grammys.

When I e-mailed a knowledgeable friend that I’d be writing on jazz and hip-hop, she replied, “Man, can people stop talking about this already?” She’s right, in a way. The jazz/hip-hop ...