Our A minor pentatonic ... II-V-I chord progression, which is so prevalent in the musical genres mentioned above. I would urge you to explore the harmonic minor scale across the entire guitar ...

The main scale of choice here is the E major pentatonic scale (E-F#-G#-A-C#) and this can be combined with the E minor ... chord (E-G#-B-D) which is a key way those more advanced sounding country ...