This video explains the concept of musical intervals and how they relate to chord progressions. It breaks down the 12 notes of a musical scale into six core "places" a chord can move to from its starting point, based on the number of semitones away (1-6). The presenter demonstrates how to use tools like common tones, contrary motion, and counter melodies to create more interesting and nuanced chord progressions, moving beyond simple, overt movements. The video concludes by introducing the "wormhole method" for musical discovery.