Spideryak, pretty cool BT but much too complex and fast for my skill level. What your post did for me, however, was to use a site I found awhile back to go looking for BT progressions other than the 1, 4, 5.
The site listed below has a number of different progressions and songs using them, (click on the progression for a list), but no backing tracks. I have, for quite awhile, tried to hear how different progressions sound but have had no success at doing this listening to songs.
What your post did for me was to think of a way to find backing tracks in different progressions. I am taking a progression from the site and searching YouTube for backing tracks matching a progression. SUCCESS!!.
Finding BT with a variety of different progressions is allowing me to play along with tracks other than using the blues standard of 1, 4, 5.