Drop C (CGDC) Tuning
Tune your cello to Drop C (CGDC) — C2, G2, D3, C3
About Drop C (CGDC) Tuning
Drop C tuning (C2-G2-D3-C3) modifies standard tuning by lowering only the A string from A3 down to C3, creating a unison with the pitch one octave above the lowest open string. This gives the cellist three strings tuned to notes of the C major triad (C2, D3 as the second degree, and C3) plus the open G2, heavily weighting the instrument's resonance toward the key of C. The tuning appears in select contemporary cello works where composers want expanded open-string possibilities in C without fully abandoning the standard tuning framework.
The most striking feature of Drop C is the relationship between the outer strings: the lowest C2 and the retuned highest string C3 sit exactly one octave apart, creating a powerful octave resonance that frames everything played on the inner G and D strings. This octave coupling gives passages in C a depth and solidity that standard tuning cannot match. The middle two strings (G2 and D3) retain their standard pitches and fifth interval, so much of the cellist's standard technique on the inner strings transfers directly.
Drop C is particularly effective for music that centers on C as a tonal anchor — whether C major, C minor, or modal music built on C. The open C3 on the top string functions as a high drone or pedal tone, and the cellist can play melodies on the D and G strings against this sustained C. Some cellists also use this tuning for free improvisation, where the reinforced C tonality provides a gravitational center for exploratory playing.
String Notes
Recommended Strings
The lower three strings (C2, G2, D3) remain at their standard pitches and use standard strings. The A string must be lowered from A3 to C3, a drop of a major sixth, which dramatically reduces its tension. A standard A string tuned this low will feel very slack and may produce a weak, unfocused tone. Consider replacing the A string with a heavier gauge — some cellists use a second D string or a dedicated C3 string to get adequate tension and tone quality at this lower pitch. The string should vibrate clearly and respond well to the bow without excessive pressure.
How to Tune to Drop C (CGDC)
- 1.Start from standard CGDA tuning. Only the A string needs to change — the lower three strings stay at their standard pitches.
- 2.Lower the A string from A3 (220 Hz) down to C3 (130.81 Hz). This is a large drop — a major sixth — so lower the string gradually to avoid sudden tension changes on the instrument.
- 3.Verify the C3 by playing it against the open C2 string. They should produce a clean, beatless octave. If you hear any wavering, adjust until the octave is perfectly pure.
- 4.Check that the G2 and D3 strings remain at their standard pitches and that the G-D fifth is still clean. The tension change on the top string can slightly affect the instrument's neck relief.
- 5.Play all four strings open. You should hear C2-G2-D3-C3, a voicing that emphasizes the key of C. The upper C3 and lower C2 should ring with strong octave resonance.
Best Keys for Drop C (CGDC)
C Major
The home key, powerfully reinforced by open C strings on both the lowest and highest positions. Melodies on the G and D strings are framed by this C octave pedal.
C Minor
Achieved by fingering Eb on the inner strings. The open C octave provides a dark, resonant foundation for minor-key passages and the key's dramatic character.
G Major
The dominant key. The open G2 serves as tonic while the D3 provides the dominant of G. The upper C3 functions as the subdominant, completing the harmonic framework.
D Minor
The open D3 string serves as tonic. The surrounding C strings create a strong pull toward C that gives D minor passages a restless, yearning quality characteristic of this key on cello.