One + guitarist who is helping to redefine the craft. 

Tosin Abasi

Of Animals as Leaders fame, Tosin comes from a classical background and has melded centuries of musical progression into what can only be described as a phenomenal mastery of the instrument. His spider like ability to crawl across the notes in such a fluid, precise and complex manner allow him to create a sonic maze that gives the listener a multitude of options to navigate.

https://www.youtube.com/watch?v=O46v33hpx4Q

The beauty in how he has chosen to express himself is in the absolute command he has in the way the sounds are presented. While his music is not for everyone, his talent and influence on the genre is undeniable.

https://www.youtube.com/watch?v=toLyXi2v2Fk

Derek Trucks (the +1)

I had to sneak this guy in on this post just because he is without doubt one of the most formidable guitarists in the world right now as well. I saw him play with Eric Clapton and to be honest, he stole the show by producing the most delicate and powerful blues slide guitar I've ever come across.

https://www.youtube.com/watch?v=C0hr2HWOohM

Skip to 4:00 for the goodness but it doesn't hurt to listen to a band made up of hot players and Susan Tedeschi who sounds like a young Bonnie Rait.

https://www.youtube.com/watch?v=vVmN4KwO5t8

Straight up blues - enjoy :)