A few days ago I went to see Beth Hart in concert at the Royal Festival Hall. "Now we've had Beth Hart before" on the  MUSIC SPOT  - I heard you shout. Brilliant concert, she really was amazing and played so much great music during an emotional and exciting performance and tempting though it is to post any of the night's songs, I'll stick with tradition of the no repeat guarantee.
However I'm not straying far from blues/rock, so how about something from the late-great Gary Moore, here in a tribute concert from 2005 for the late-great Phil Lynott. 
As he informs us there were two versions of this song, written by Phil. One slow and the better known single version. 'Don't Believe a Word' !

Not entirely without coincidence this weekend marks 40 years since this single was released by Thin Lizzy. It also had an excellent 'B' side called 'Old Flame' > well worth a listen:
 https://www.youtube.com/watch?v=tnaFRxsnfIU