Welcome to LivingPianos.com. I’m Robert Estrin. Have you ever heard someone play the piano and every chord just sounds beautiful? Whether they’re reading written music or improvising, the chords seem rich and perfectly balanced. Yet when you try to do the same, the chords might sound cluttered or harsh. Why is that? It turns out, the secret to beautiful-sounding chords lies in something deeply rooted in nature: the overtone series.
What Is the Overtone Series?
The overtone series is the natural phenomenon that gives sound its color and character. Any musical sound—whether from a piano, another instrument, or even a non-musical source—contains more than just its fundamental pitch. Overtones are additional pitches that naturally occur above the fundamental note. They’re what give sound its richness, just like how a color is often made up of many different shades. A pure sine wave with no overtones sounds flat, lifeless, and boring. When overtones are present, the sound becomes full and musical.
You can even observe overtones on the piano. By silently pressing a high C key (lifting the damper without making sound), and then firmly playing a lower C, the higher string will begin to vibrate sympathetically. This demonstrates that the higher C is part of the overtone series of the lower C.
The Pattern of Overtones
The overtone series begins with notes that are far apart and gradually get closer together. Starting from the fundamental tone, each successive overtone comes closer in pitch to the next. After a certain point, the overtones are separated only by half steps. This pattern is crucial because it explains why some chords sound better than others. When chords are constructed in a way that aligns with the spacing of the overtone series, they naturally sound pleasing to the ear.
Spacing Is Everything
Here’s where this becomes especially practical for piano players. Chords voiced with wide spacing between the bass and the upper notes tend to sound much better than chords that are clustered closely in the lower registers. For example, if you play a chord in the left hand using tightly packed notes, the result is often muddy and unpleasant. But if you space the bass note well below and place the rest of the chord in the right hand, the result is far more pleasing. This principle isn’t just for improvisation or modern styles. It has deep roots in Western classical music.
The Influence of Bach and Western Harmony
Western harmony, as we know it, evolved from vocal writing, particularly in the chorales of Johann Sebastian Bach. These chorales consistently show that the bass note (the lowest note) is spaced significantly below the upper voices. This spacing mirrors the overtone series and results in a resonant, clear sound. Even in simple tunes like “Happy Birthday,” when chords are voiced with space between the bass and the upper notes, the result is much more satisfying.
Beethoven and Beyond
This approach to chord voicing is not limited to Baroque music. Take, for example, the second movement of Beethoven’s Pathetique Sonata. When the arpeggios in the left hand are reduced to block chords, you can see how Beethoven employs the same concept. The bass notes are separated from the other tones, allowing the chords to breathe. This is a continuation of the harmonic principles established through centuries of musical development, rooted in the overtone series.
Applying This to Your Playing
Whenever you play chord progressions, remember to space your chords so that the bass note stands apart from the upper notes. Let the right hand handle most of the chord tones, especially when supporting a melody. Whether you’re playing simple triads or complex harmonies, this approach creates a much more rewarding and musical sound. Compare this to playing everything close together in your left hand and it usually results in a cluttered mess. Giving your chords room to resonate in line with the overtone series is key to making your playing sound professional and beautiful.
A Universal Principle
This concept of voicing chords according to the overtone series isn’t limited to classical music. From Bach to Beethoven and into contemporary styles, it’s a universal principle of good voice leading and harmonic balance. By understanding and applying this natural spacing, you can dramatically improve the sound of your chords. I encourage classical players to study their scores and observe how often composers use this technique. It’s everywhere, once you start to notice it. Thanks for joining me. I’m Robert Estrin, and this is LivingPianos.com, Your Online Piano Resource.