You can blame Josh Davis for inventing and perfecting trip-hop/instumental hip-hop, whatever you want to call it, with Entroducing...
Since that seminal release there have been a lot of imitators, but very nary a duplicator. There still hasn't been anyone who has come as close to perfection as DJ Shadow did on that album, but, RJD2, Cut Chemist and Pretty Lights have all had brushes with greatness in the same genre.
A few days ago I was introduced to Blockhead, a Manhattan beatmaster that makes his own form of down tempo, instrumental hip-hop. He does it without mimicking anyone else, just throwing the beats and samples into a pot and coming up with his own funked up stew.
MP3: Blockhead - It's Raining Clouds