A capo does not change the relationship between strings. It shortens every string by the same amount. It is useful for matching a singer’s range, creating a brighter sound and simplifying chord shapes. A capo clamps all selected strings at one fret, creating a temporary new nut. It raises the pitch of open-position shapes without changing their fingering relationships.
The fret number tells you the transposition
Each fret raises pitch by one semitone. A C shape with a capo at the second fret sounds D; a G shape at the third fret sounds B-flat.
Shape name versus sounding chord
With capo 2, an open G shape sounds as A major.
Capo placement affects tuning
Place the capo just behind the fret with only enough pressure for clean notes. Too much pressure or a capo positioned far from the fret can pull strings sharp.
Pressure
Too much pressure can pull notes sharp; too little causes buzzing.
Retuning
Applying a capo can slightly change tuning, so check again after placement.
A capo also changes the physical colour
Moving open shapes higher shortens the vibrating strings and produces a brighter, tighter sound. Two guitars can play complementary parts by using different shapes and capo positions while sounding in the same key.
Capo notation can use shape names or sounding names
A chart may say play G with capo 2, meaning use a G shape that sounds A. Agree on whether musicians are calling shapes or concert pitches so the band does not transpose the part twice.
Check your own setup
- Tune before applying the capo.
- Place it close behind the fret wire.
- Check all strings for buzz and sharpness.
- Retune lightly if necessary.
- Remove it after playing rather than storing the guitar clamped.
- Tune the guitar first, place the capo carefully and check tuning again.
- Play one familiar progression at several capo positions and name both the shape and sounding key.
When you are unsure what to change
The guitar sounds sharp
Reduce capo pressure or place it closer to the fret wire.
Some strings buzz while others go sharp
Reposition the capo evenly close to the fret. If its pressure is adjustable, reduce it until the strings are held cleanly without excessive compression.