HearmonyWhat Is Harmony in Music? Meaning, Examples and How to Hear It
Harmony in music is the sound of two or more different notes played or sung at the same time, and the way those combinations move from one to the next. A melody is a line of single notes heard one after another; harmony is what happens underneath and around it, usually as chords. When a guitarist strums C, F and G while you sing a tune, the tune is the melody and the chords are the harmony.
What does harmony mean?
In music, harmony means notes sounding together and the relationships between them. Musicians often describe it as the "vertical" side of music: stack the notes that sound at one moment on top of each other, and you get a chord. Melody is the "horizontal" side, the line that moves through time.
Outside music, harmony means agreement or things fitting well together, and the musical meaning grew from the same idea: notes that agree with each other. But harmony in music is not only pleasant agreement. Tense, clashing combinations are part of it too, and much of the interest comes from tension that resolves. The Wikipedia article on harmony follows how the idea has changed across styles and centuries.
Melody vs harmony vs rhythm
Melody, harmony and rhythm are the three building blocks most music lessons start with, and one familiar tune shows all three. Take the first two lines of "Twinkle, Twinkle, Little Star" in C major.
| Element | What it is | In "Twinkle, Twinkle" |
|---|---|---|
| Melody | Single notes in a row: the part you sing | C C G G A A G, then F F E E D D C |
| Harmony | Notes sounding together, usually chords, and how they change | C chord, F chord, C chord; then F, C, G, C |
| Rhythm | When notes happen and how long they last | Six quarter notes and a half note on each line |
The melody tells you what the song is. The harmony tells you how it feels at each moment. Play the same melody over different chords and the mood changes, even though not a single note of the tune moved.
Consonance and dissonance: why some notes blend and others clash
Consonant intervals sound stable and blended; dissonant intervals sound tense and want to move somewhere. Harmony is built from both. In Western music the usual grouping looks like this, with examples above C:
| Interval | Example | Usually heard as |
|---|---|---|
| Octave | C–C | Consonant: almost one sound |
| Perfect fifth | C–G | Consonant: open and strong |
| Perfect fourth | C–F | Consonant on its own; treated as unstable above the bass in classical harmony |
| Major and minor third | C–E, C–E♭ | Consonant: warm, the core of chords |
| Major and minor sixth | C–A, C–A♭ | Consonant: sweet |
| Major and minor second | C–D, C–D♭ | Dissonant: rubbing, buzzing |
| Major and minor seventh | C–B, C–B♭ | Dissonant: wants to resolve |
| Tritone | C–F♯ | Dissonant: the most restless interval |
Part of the reason is physics. Two notes an octave apart vibrate in a 2:1 frequency ratio, a perfect fifth in roughly 3:2 and a major third in roughly 5:4, so their overtones line up. Seconds and sevenths have more complex ratios, and their overtones beat against each other. Culture and context do the rest: a minor seventh that sounds harsh in a hymn sounds normal in blues.
Dissonance is not a mistake. A dissonant note that steps to a consonant one, like B moving up to C or F moving down to E over a G7 chord resolving to C, is the motion that makes harmony feel like it is going somewhere.
Chords, progressions and voice leading in plain words
Most harmony is organized into chords, and chords are organized into progressions. Three ideas cover the basics.
Chords
A chord is three or more notes sounding together. The most common kind is the triad, built by stacking two thirds: C–E–G is C major, C–E♭–G is C minor. The guide to triads lays out all four triad types and the chords that belong to each major key.
Progressions
A chord progression is the order the chords come in. Each chord has a job in the key: the I chord is home, the IV chord moves away, and the V chord builds tension that pulls back to I. In C major, I–IV–V–I is C, F, G, C, and you can hear it as "home, away, tension, home".
Voice leading
Voice leading is how each note inside one chord moves to a note in the next. Good voice leading keeps the moves small. Going from C major (C–E–G) to F major, a pianist will often play C–F–A: C stays put, E steps up to F and G steps up to A. The chords change completely, yet each finger moves one step at most, and the ear hears smooth lines instead of jumps.
Singing harmony works the same way. Sing the opening of "Twinkle, Twinkle" (C C G G A A G) while someone else sings E E E E F F E. The second part barely moves, yet each of its notes belongs to the chord underneath: C major, then F major, then C major again.
Homophony and polyphony: kinds of musical texture
Texture describes how melody and harmony are layered, and three words cover most music.
- Monophony: one melody line with no harmony. A single voice singing a folk song unaccompanied, or Gregorian chant sung in unison.
- Homophony: one main melody with chords supporting it. A singer with a strummed guitar, a hymn where all voices move in the same rhythm, almost all pop songs.
- Polyphony: two or more independent melodies at once, with the harmony arising where they meet. A round like "Row, Row, Row Your Boat", or a Bach fugue.
Harmony exists in all but the first. In homophony it sits behind the melody as chords; in polyphony it comes from separate melodic lines lining up moment by moment.
How to start hearing harmony
Most listeners follow the melody and let the harmony wash past. You can learn to hear it in layers, and the easiest place to start is the bottom.
- Follow the bass line. Put on a song you know well and hum only the lowest notes. In most pop and folk songs the bass plays the root of each chord, so the bass line is a map of the harmony.
- Count the chord changes. Tap once every time the harmony shifts. Many songs change chord once or twice per bar.
- Name the color. For each chord, decide only "bright" (major) or "darker" (minor). The guide on how to identify chords by ear takes this further.
- Feel home and away. Notice which chord sounds like the end of the song. That is the I chord; everything else is a trip away from it.
- Match the pattern. Once you hear home, away and tension, try fitting I, IV, V and vi to the song. The step-by-step method is in how to hear chord progressions.
Play a single C on a piano, then a C major chord, then a C minor chord, five times each. Listen for the moment the chord stops sounding like "one note" and starts sounding like a color. That shift is your ear starting to hear harmony as harmony.
If you are new to ear training in general, start with the ear training exercises for beginners, which place chord work after the basics of pitch and intervals.
Train your ear for harmony in Hearmony
Hearmony trains the listening side of harmony in two adventures. Chord Garden plays chords and asks you to name their quality: major and minor first, then diminished, augmented, sus2 and sus4. Progression Highway moves on to how chords follow each other: I–IV–V, the I–V–vi–IV pop progression, ii–V–I, the four common phrase endings, and finding the missing chord in a progression.
Earlier lessons also play intervals as two notes at once, the smallest unit of harmony, so you learn to hear a third or a fifth stacked before you meet full chords. Each lesson is 10 questions. Hearmony is an iPhone app, available on the App Store.