This masterclass focuses on the importance of the dominant seventh chord in music. Guitarist Guthrie Trapp begins with an overview of chord inversions and chord shapes across the fretboard. He emphasizes learning chord positions to understand how chords are connected.

Trapp then dives into the dominant seventh chord in detail. He explains how it pulls the ear to the major third of the next chord. He demonstrates exercises to target the major third using arpeggios and scales over different chord progressions. Trapp also discusses how to incorporate minor and major pentatonic scales over dominant seventh chords.

In the second half, Trapp takes questions from viewers. He provides examples of lines and licks that incorporate bending notes and blue notes over dominant seventh chords. Trapp also discusses mode mixing by stealing lines from related major and minor scales. Throughout, he stresses compartmentalizing the fretboard and understanding chord tones.