Understanding the 3 Parts of a Suspension in Music

A suspension is a type of non-chord tone that creates brief dissonance before resolving to a chord tone. It is a staple in classical, jazz, and popular music, adding tension and release that drives harmonic motion. To understand how suspensions work, you need to know its three distinct parts: preparation, suspension, and resolution. Each part plays a crucial role in the suspension's effect. This article breaks down these components with practical examples and tips for incorporating them into your own compositions.

The Three Parts of a Suspension

Every suspension follows a three-step pattern: a note is prepared as a chord tone, held over into the next chord where it becomes a dissonance, and then resolves stepwise down to a chord tone. These three stages are called preparation, suspension, and resolution.

Preparation

Preparation is the note that will become the suspension. It must be sounded as a chord tone in the previous chord. This means the note is consonant—it fits harmonically with the chord before. For example, in the key of C major, if you want a suspension over a G major chord, you might prepare the note D (the fifth of G) in a preceding chord like C major, where D is the second. The preparation establishes the note as part of the harmony, so the listener perceives it as stable before it becomes unstable.

Key points about preparation:

• The note must be a chord tone of the preceding chord.
• It is typically in the same voice (e.g., soprano, alto, tenor, bass) as the suspension.
• Preparation often occurs on a weaker beat or as a tie from the previous chord.

Suspension

The suspension itself is the moment when the prepared note is held over into the next chord, creating a dissonance against that chord's harmony. This dissonance is the core of the suspension's expressive power. The suspended note is not part of the new chord—it clashes with one or more notes, typically forming a 4th, 7th, or 9th interval above the bass. For instance, holding the note D over a C major chord (C-E-G) creates a dissonant 2nd (D vs. C) and a 4th (D vs. G). The suspension usually occurs on a strong beat, emphasizing the tension.

Key points about the suspension:

• It is a non-chord tone, meaning it does not belong to the current harmony.
• The note is tied or repeated from the preparation, not rearticulated.
• Common suspension intervals: 4-3, 7-6, 9-8 (the numbers refer to intervals above the bass before and after resolution).

Resolution

Resolution is the step that releases the tension. The suspended note moves down by step to a chord tone of the new chord. This descending motion is crucial—almost all traditional suspensions resolve downward, typically by a half or whole step. Continuing the example, the held D resolves down to C (the root of the C chord), consonant. The resolution usually occurs on a weaker beat, giving a sense of relaxation. The voice that holds the suspension must resolve smoothly; an upward leap would break the suspension's effect.

Key points about resolution:

• The note moves downward by step to a chord tone.
• The resolution note should be part of the chord you're resolving into.
• The resolution often occurs on a weaker beat or after the suspension has been held for some duration.

How Suspensions Work in Practice

Suspensions are most common in four-part harmony (SATB) but appear in any musical texture. They are often notated with a tie connecting the prepared note to the suspended note. The standard rhythm is: preparation on a weak beat, suspension on a strong beat, resolution on a weaker beat. However, composers sometimes vary the rhythm for expressive effect.

Consider a classic 4-3 suspension in the key of C major. The bass plays G (dominant), the tenor holds D (prepared from previous chord C major), the alto sings B, and the soprano sings F (which is the 7th, but we'll focus on the suspension). Actually, a simpler example: in a progression from C major to G major, the soprano might hold G (prepared as the root of C) over the G chord, creating a dissonant 4th against the bass D? Wait, better: use the 4-3 suspension. In the key of C, over the dominant G chord (G-B-D), the soprano prepares note C (from F chord, e.g., F-A-C), holds C over G chord (creating a 4th above bass G), then resolves down to B (the third of G). That's a 4-3 suspension: the dissonant 4th resolves to a consonant 3rd.

In popular music, suspensions appear as "sus chords" like Csus4 (C-F-G), where the third is replaced by the fourth. The third part of the suspension is implicit: the sus chord wants to resolve to the major or minor chord. Even without explicit voice leading, the same three-part psychology applies.

Common Types of Suspensions

While any interval can be suspended, the most common are:

• 4-3 suspension: The suspended note forms a 4th above the bass and resolves to a 3rd. This is the most standard.
• 7-6 suspension: The suspended note is a 7th above the bass, resolving down to a 6th.
• 9-8 suspension: The note is a 9th above the bass, resolving to the octave. This often occurs in upper voices.

Less common but useful are 2-3 suspensions (where the suspended note is a 2nd above the bass, resolving to a 3rd) and 5-6 suspension (rare, in minor contexts).

In modern music, suspensions are also used as chord extensions without strict preparation. For example, a guitarist might play a Dm7(add4) chord, where the fourth is held, but the preparation is less obvious. Still, the three-part structure—preparation, dissonance, resolution—remains the theoretical backbone.

Applying Suspensions in Your Music

To use suspensions effectively, start by identifying where you want tension. Place a suspension on a strong beat (like beat 1 or 3 in 4/4 time) and resolve on a weaker beat. Make sure the suspension note is prepared as a chord tone in the previous chord. In compositions, suspensions work well at phrase endings (cadences) to delay resolution, or within a sequence to add interest.

If you are writing for voices or instruments, pay attention to voice leading: the suspension note should be in a middle or upper voice (soprano, alto, tenor) and resolve downward. Avoid parallel fifths or octaves with the bass. Practice by harmonizing a simple melody: add suspensions to prolong cadences.

For jazz and pop, think of sus chords as color. A Csus4 can replace a C major chord in a progression to create anticipation. However, the three-part structure is still there: the sus chord is the suspension stage; it expects resolution. In many pop songs, the sus chord is held without resolving, which is a suspension that "never" resolves—a characteristic of modern sound.

Final Recommendation

Mastering the three parts of a suspension—preparation, suspension, resolution—will deepen your harmonic vocabulary. Start by analyzing pieces by Bach or The Beatles, looking for 4-3 or 7-6 suspensions. Write your own four-part exercises, using suspensions at cadences. Then experiment with sus chords in your guitar or keyboard playing. The key is to hear the tension and release. Once you internalize the pattern, you can apply it to any style. Remember: a suspension is not just a dissonance; it is a journey from consonant to dissonant back to consonant. Use it to add emotional depth and logical flow to your music.