How to Use Open Strings on Guitar: Creating Resonance and Color

One of the most distinctive sounds in guitar playing is the ringing, resonant quality that open strings add to chord voicings. It’s the sound that makes acoustic guitar recordings feel spacious and alive - that shimmer underneath a chord where one or two unfretted strings are humming in harmony with the fretted notes.

Learning to use open strings intentionally, rather than accidentally, is a real technique. It can transform standard chord shapes into something far more expressive.

Why Open Strings Sound Different

When you fret a string, you’re shortening its vibrating length - the string only vibrates from the fret to the bridge. An open string vibrates from nut to bridge - its full length. This produces a slightly different tone: more resonant, with more sustain and a fuller fundamental frequency.

When open strings ring alongside fretted strings, they add a halo of overtones that enriches the chord. This is especially noticeable on acoustic and semi-hollow guitars.

Open String Chord Voicings: Beyond the Basics

Most beginners use open strings in the standard open chord shapes (C, G, Em, Am, etc.) without really thinking about it. But there are dozens of voicings specifically designed to let open strings ring in unusual ways.

Adding Open High-E to Any Chord

One of the simplest tricks: play any chord that naturally avoids the high E string, and let it ring anyway.

Cadd9 (adds open B and E):

e|---0---|
B|---3---|
G|---0---|
D|---2---|
A|---3---|
E|---x---|

The open E and B strings add a 9th and a 5th to C major. This is the famous Cadd9 voicing that appears in countless folk and pop songs.

Gsus2/D (all strings ring):

e|---3---|
B|---3---|
G|---0---|
D|---0---|
A|---2---|
E|---3---|

Here the open G and D strings ring perfectly against the fretted notes. Everything vibrates sympathetically.

Open-String Voicings for More Complex Chords

Dmaj9 (using open B and E):

e|---0---|
B|---0---|
G|---2---|
D|---0---|
A|---x---|
E|---x---|

D - F# - A - C# - E. The open B and E strings add the major 7th (C# is not here - wait, let me re-check: D major root is D, the open strings are E and B. E is the 9th of D, B is the 6th. So this is more of a Dadd9/6 or D6/9)

Em11 (a deeply resonant chord):

e|---0---|
B|---3---|
G|---0---|
D|---2---|
A|---2---|
E|---0---|

E - G - B - D - G - E. The open E strings at top and bottom bracket the chord in a resonant halo.

Open Strings as Drone Notes

A drone is a sustained note that continues through harmonic movement. Open strings make natural drones because they keep ringing while you move chord shapes above or below them.

High-E Drone

Keep the open high E ringing while moving chord shapes on the lower strings:

E - F#m(no 5th) - A - B: All work with open high E
Play each chord, letting E ring on top

The effect is a held melodic note with harmonic movement underneath - very effective in folk and country guitar.

Low-E and A Drone

In drop D or standard tuning, let the bass strings ring while playing chord shapes on the upper strings. This creates a “big room” sound that’s common in acoustic fingerstyle.

Sympathetic Resonance

One underappreciated benefit of open strings: when you play a fretted note that matches an open string’s pitch, the open string vibrates in sympathy - even without being plucked. This “sympathetic resonance” creates a ghostly doubling effect.

You can use this deliberately:

When you fret an E note anywhere on the neck, the open E strings will ring slightly
When you play an A, the open A string sympathizes
Playing in the key of E or A on guitar activates the most resonance for this reason

This is partly why guitarists often say that E and A are the “best-sounding” keys on guitar - it’s not just preference, it’s physics.

Incorporating Open Strings Into Lead Playing

In solo and lead contexts, open strings can act as “pedal points” - sustained notes beneath a moving line.

Example: E-string pedal point in A minor Play a descending scale line on the B and G strings, letting the open low E ring through each note:

Notes: Am-ish descending...
e|---0---0---0---0---|
B|---8---7---5---3---|
G|---9---7---5---4---|
D|---x---x---x---x---|
A|---x---x---x---x---|
E|---0---0---0---0---|

The open E grounds every note of the descending line. This technique sounds sophisticated but is relatively simple to execute.

Open String Chord Clusters

For adventurous players: combining open strings with notes that aren’t in the standard chord creates “cluster” voicings - notes a half or whole step apart that ring together. These can sound dissonant but beautiful, especially in indie, ambient, and experimental rock.

Try this cluster:

e|---0---|  (E)
B|---3---|  (D)
G|---2---|  (A)
D|---0---|  (D)
A|---x---|
E|---x---|

The E on top is a half step from the D on the B string - a dissonant cluster that still works as a Dadd11 or D9sus4 type voicing. In context, it can sound haunting and beautiful.

Try This in Guitar Wiz

Guitar Wiz’s Chord Library includes many voicings that deliberately incorporate open strings for their resonant quality. When you look up any chord, scroll through the multiple positions - you’ll find some positions that use open strings and some that don’t. Compare the sound: open-string voicings tend to ring longer and sound fuller on acoustic guitar.

The interactive chord diagrams clearly show which strings are open (O markers) and which are fretted. Use this to find voicings you’ve never tried before - especially for major 7th, add9, and sus2 chord types, which often have beautiful open-string positions.

If you’re writing songs, use the Song Maker to build progressions with open-string-friendly voicings. Notice how the overall sound of the progression changes when open strings are ringing versus when everything is fretted.

Download Guitar Wiz on the App Store · Explore the Chord Library →

FAQ

Why do open strings ring differently from fretted notes?

Open strings vibrate along their full length (nut to bridge), producing a fuller fundamental and richer overtones than fretted notes, which vibrate over a shorter distance.

Should I mute open strings I’m not using?

In most playing contexts, yes - unintentional open strings create unwanted noise. But intentional open strings can enhance chord voicings and lead playing. Learning the difference is the skill.

What keys work best with open strings?

E, A, D, and G work best with standard tuning open strings because the open notes (E, A, D, G, B, E) naturally fit these keys. Other keys often require a capo to bring open strings into the right harmonic relationship.