How do drones create harmony in folk music?

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folk music American folk-blues singer, songwriter, and guitarist Lead Belly.

In folk music, a drone creates harmony by providing a sustained, sonorous foundation—typically a low-pitched tone—over which a melody is played at a higher pitch level.1

Rather than relying on complex chord progressions, the drone establishes a constant tonal center. This effect is achieved through various methods:

Instrumental Design: Many folk instruments, such as the bagpipe, hurdy-gurdy, dulcimer, and banjo, feature dedicated pipes or strings specifically engineered to produce a continuous or intermittent drone.1
Performance Technique: Musicians may create drones manually, such as folk fiddlers who bow an open string simultaneously with the melody played on an adjacent string.1
Harmonic Intervals: While often a single pitch, a drone can also consist of an interval, most commonly a fifth, to add harmonic depth to the performance.1

By anchoring the music to a steady, resonant base, the drone creates a characteristic texture that defines the sound of many traditional European and American folk styles.1