30-day guitar challenge: It's common for guitarists to reach a plateau whereby they have the five pentatonic scale shapes down but struggle with the challenge of using those shapes in a musical way.

When to use it: For a relaxed, but generally major key vibe. Over a I-IV-V progression (such as G-C-D) where the V chord is the root (D-C-G). Mixolydian is a versatile scale. Its sonic signature is ...