How to Tune to 55503 (CGDAAC)
Known by its fret-interval label '55503', CGDAAC stacks fifths from a low C up to a doubled A, with a C on top. The unison A strings ring together for a shimmering drone, while the fifth-based low end gives a huge, open foundation for adventurous fingerstyle.
Start in standard tuning (E-A-D-G-B-E) and change 5 of 6 strings:
| String | Standard | Target | What to do |
|---|---|---|---|
| String 6 | E2 | C2 | Tune down 4 semitones |
| String 5 | A2 | G2 | Tune down a whole step |
| String 4 | D3 | D3 | Leave as is |
| String 3 | G3 | A3 | Tune up a whole step |
| String 2 | B3 | A3 | Tune down a whole step |
| String 1 | E4 | C4 | Tune down 4 semitones |
String Tension & Setup Tips
Recommended Gauge:The low E drops to C and the A to G, so heavier bottom strings help. The doubled A's and top C sit near or slightly below standard tension.
Gear for 55503 (CGDAAC)
Tools that make tuning to C - G - D - A - A - C easier.
D'Addario Universal Micro Headstock Tuner
A headstock tuner makes switching in and out of this tuning quick, even on stage or without a mic.
D'Addario Pro-Winder (winder + cutter)
Retuning 5 strings means a lot of turning — a winder speeds it up and trims new strings too.
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Frequently Asked Questions
How do I tune to 55503 (CGDAAC)?
From standard tuning (EADGBE), retune each string low to high: 6th E→C, 5th A→G, 4th D (unchanged), 3rd G→A, 2nd B→A, 1st E→C. Match each string to its exact Hz using the interactive tuner above.
What is special about the 55503 tuning?
Its stacked fifths and unison A strings create a wide, ringing drone with a bright shimmer on top, giving big open textures favoured for experimental fingerstyle.