I'd to point out the fantastic classic art of one James Flora.
As is often the case with things visual, I knew Flora's work because it was in my molecules, in the air, rather than in my head. Then, my colleague Tim Biskup* came to work on my show Oh Yeah! Cartoons as a creator, background designer and (fantastic) painter, and started bringing in truckloads of his LP collection for reference and inspiration. He politely exported his passion and excitement for Jim's work, and, me being me, I became a huge fan. Being a huge jazz fan too didn't hurt. And somehow, it's fitting to me that on my Amazon.com page, Tim's books come up when I search Flora.)
*Check out the fantastic postcard Tim painted for us at Oh Yeah! And, his own cartoon, too.