Hands down my favorite living Jazz bassist, Victor Wooten, is involved in a progressive metal project. 
Had no idea he was doing anything like this, I'm really excited to hear it.
Here's an example of what he does as a solo artist, although he's a very diverse player in general:

Had no idea he was doing anything like this, I'm really excited to hear it.
Here's an example of what he does as a solo artist, although he's a very diverse player in general: