Pedal tones, sometimes called pedal points or drones, are sustained notes—typically in the bass—that hold steady beneath changing harmonies. The term “pedal” comes from the organ or piano pedals, where a note can be continuously held to create a foundation for the music above.

In practice, a pedal tone is a single pitch that remains constant while the chords or melodies above it shift. For example, a low C might ring continuously while the harmonies move through different keys or chords. Because the pedal note is often part of the original key or tonal center, it grounds the music, but when the harmonies above clash with it, tension is created.

This tension arises from the dissonance between the sustained pedal tone and the non-chord tones that appear in the changing harmonies. When the upper voices form intervals that don’t naturally blend with the pedal note—such as minor seconds or tritones—it results in a feeling of unrest or suspense. Composers and arrangers use this effect to build drama, create suspense, or highlight a transition.

Once the harmony resolves back to chords that comfortably include the pedal note, the tension releases, providing a satisfying resolution. This push and pull between stability and dissonance makes pedal tones a powerful tool for shaping the emotional flow in music.