Guitar scale
C# Major (Ionian) Guitar Scale
C# Major (Ionian) is a seven-note scale built from C#, D#, E#, F#, G#, A#, and B#. It is the 1st relative mode of C# major. It is also commonly called C# Ionian. Use it to study the scale's notes, interval formula, and guitar fretboard positions.
- Notes
- C#, D#, E#, F#, G#, A#, B#
- Formula
- 1 2 3 4 5 6 7
- Semitones
- 0 2 4 5 7 9 11
- Parent scale
- C# major
- Also called
- C# Ionian
How to read this scale
The notes are shown as pitch classes first. Square markers representC# root notes in the fretboard view, while circular markers represent the other notes in the scale.
Use the interactive fretboard to locate the C# root notes and connect the remaining major (ionian) tones across standard tuning.
This same note pattern is also commonly called C# Ionian.
Sound and defining tones
C# major gets its clear major quality from 3 (E#) and 7 (B#). The major third establishes the chord quality, while the major seventh acts as a leading tone that pulls strongly back to C#.
- Characteristic tones
- 3E#7B#
Fretboard diagram
Open this scale in the fretboard tool
Start with C# Major (Ionian) loaded, then adjust tuning, labels, colors, fret count, and orientation.
Open in interactive fretboardCommon chords and contexts
Use C# major as the complete note set for diatonic harmony in the key of C#. Follow the chord tones as the progression changes instead of treating every scale note as equally stable.
- Use C# major over C# major, C#maj7, and straightforward major-key progressions.
- It is also the parent scale for the seven major-scale modes that share the same notes.
Practice this scale on guitar
- Play C# Major (Ionian) from one C# root to the next in at least two fretboard positions, saying each note name and scale degree aloud.
- Alternate short phrases that land on 3 (E#) and 7 (B#), then resolve each phrase to the nearest root or fifth.
- Improvise over a simple C# major progression and target the current chord's root, third, or fifth on each chord change.