Thought I'd update this thread with some backing track sites that I use a lot and which are not all Blues related.
All of these sites have Blues tracks to varying degrees, but they offer much more than just Blues and are lots of fun to play to.
I like them because they take me out of my comfort zone and force me to think and play in different ways.
And since 90% of what they have to offer can be played with Pentatonic scales, you'd be surprised at how much of what you can learn to play on these sites can be easily incorporated into a 12-bar Blues.
Dopez Tracks.
Basically Rock, Hard Rock, Rock Ballads, Metal and some other stuff.
https://www.youtube.com/channel/UC3ldfE0OgtRepd2jyaPOD_g
Y T Jam Tracks.
Lots of 80's Rock, Atmospheric tracks, Metal and Hard Rock.
https://www.youtube.com/channel/UCdMqonsla0BK21Fnf9Qx5Wg
https://www.youtube.com/channel/UCdMqonsla0BK21Fnf9Qx5Wg
Sebastien Zunino.
Some Blues and other basic stuff, but mostly Jazz Fusion styles and lots of Modal grooves.
https://www.youtube.com/channel/UC4wErHDpSOgoFGTWrWaDwEg
https://www.youtube.com/channel/UC4wErHDpSOgoFGTWrWaDwEg
Bart Bijvank.
Almost exclusively Fusion Funk tracks. Tons of Modal stuff and even some polyrhythmic stuff.
As far from Blues as one can get, but it's a lot of fun and often quite challenging and a great way to expand your playing horizons.
https://www.youtube.com/channel/UCgeGz1Cvy22EVpBo-yp934w
https://www.youtube.com/channel/UCgeGz1Cvy22EVpBo-yp934w
Elevated Jam Tracks.
Blues, Blues Rock, Atmospheric and some Hard Rock.
Major and Minor scales, Modal stuff (lots of Dorian) and all generally run 10 min. or longer.
Many of their tracks have been used in the VJR.
https://www.youtube.com/channel/UCqAZJmEC2-C9roOB4vgzROA
https://www.youtube.com/channel/UCqAZJmEC2-C9roOB4vgzROA
Quist.
Jazz, Blues, Latin, Modal and lots of other stuff.
Some of the first tracks I ever played to.
https://www.youtube.com/user/QuistTV
Nick Neblo.
Blues, Rock, Hard Rock Ballads, Latin, Psychedelic & more.
https://www.youtube.com/user/nebloproject