Craig Wright, teaching Yale's Listening to Music course, explains how harmony functions in Western music. He shows how triads are built from scales, walks through common harmonic progressions, and covers modulation between keys. The lecture trains listening skills directly, asking students to hear whether chords in a given phrase are changing at regular or irregular rates. Wright draws examples from grand opera, bluegrass, and 1960s American pop to show the same harmonic principles operating across very different styles. The lecture runs in five chapters, moving from basic chord formation through progressions, major versus minor harmony in popular songs, and finally modulation. Recorded in fall 2008 as part of Yale's open Listening to Music series, it assumes no prior music theory and builds concepts step by step with recorded musical excerpts.