Rock Guitar Lessons Arlington, Texas with John Davis. Combining A Minor Pentatonic Scales with Mode Shapes. Texas guitar Instructor John E. Davis jams a Pentatonic soloing video combining pentatonic scales with A minor mode shapes over a melodic jazz rock progression. Lead Guitar Lessons. John E. Davis is the owner and CEO of the Texas Guitar School located in Arlington, Texas. For more information visit www.TexasRockGuitarist.com.