Head and hand knowledge only get you so far — to play what you actually hear, you have to connect sound to fingers. This lesson makes the case for a few minutes of daily ear training centered on consonance and dissonance, and recommends two tools that make it easy and fun: the Sonofield Ear Trainer app for away-from-guitar practice (start with the Degrees preset on Novice; sonofield.com/FRETSCIENCE for 20% off Pro), and an infinite-sustain (Freeze) pedal for droning the root under every scale exercise so your ear learns the "feel" of each scale degree.