Understand harmonic building blocks that support melodies and create emotional context. Start with major and minor triads, progress to seventh chords, suspended, diminished, augmented, and extended voicings. Learn chord construction (1-3-5 intervals), progressions (I-IV-V, ii-V-I), and voice leading (smooth transitions).
Chords work across all instruments—guitarists finger shapes, pianists see stacked thirds, horn players voice parts. Master common progressions used in thousands of songs (4-chord pop progression: I-V-vi-IV). Chord knowledge unlocks songwriting, accompaniment, improvisation, and transposition. Apps like ChordBank or Ultimate Guitar provide references. Practice switching smoothly between chords.
Harmonic ear training develops naturally. Foundation for all Western music theory.