Which scale can I play over the whole ii–V–I in C major?

All three chords are diatonic to C major, so a single C major scale covers the entire progression. That is also its trap: playing one scale through all three chords makes the changes disappear. Use the scale as the note pool and the chord tones as the targets.

Why does G7 pull towards Cmaj7 so strongly?

G7 contains the tritone B–F. B wants to rise a half step to C, F wants to fall a half step to E. Both resolutions land inside Cmaj7, so the chord change resolves two tensions at once.

Do I have to play the chords as 7th chords?

No. Dm – G – C works the same way harmonically. The 7ths just make the guide-tone motion audible, which is why they are the standard voicing for practising this cadence.

The ii–V–I in C major on guitar

The ii–V–I is the most common cadence in jazz and pop harmony, and Dm7 – G7 – Cmaj7 is its home version in C major. The ii chord sets up the dominant, the dominant builds tension with its tritone (B and F), and the I chord releases it. Everything below is computed from the actual chords, so you can follow the same reasoning with any key you enter into the tool.

Dm7 | G7 | Cmaj7

Chord tones

Dm7D – F – A – C1 – b3 – 5 – b7
G7G – B – D – F1 – 3 – 5 – b7
Cmaj7C – E – G – B1 – 3 – 5 – 7

Open in the improviser →

Connections: G7 → Cmaj7

G → Gcommon tone
B → Chalf step up
F → Ehalf step down
D → Ewhole step up

Common tones: G, B

Why this works

What makes this cadence hold together is not the roots - it is the guide tones, the 3rd and 7th of each chord. Over Dm7 they are F and C. Over G7 they are B and F: F is held over from Dm7, B is new and is the leading tone of the key. Over Cmaj7 they are E and B: F falls a half step to E, B stays put. So across three chords the two most important voices move a total of one semitone. If your improvised line lands on those notes at the bar lines, the progression is already audible without any accompaniment - which is exactly what the fretboard view shows you.

How to practice this

Loop the progression slowly (around 80 BPM, four beats per chord) and work through these steps in order.

Step by step

Play only the 3rd of each chord on the downbeat: F over Dm7, B over G7, E over Cmaj7. Nothing else.
Play only the 7th of each chord on the downbeat: C over Dm7, F over G7, B over Cmaj7.
Connect them: start on F over Dm7, hold it into G7 (where it is the 7th), then resolve it down to E over Cmaj7.
Now improvise freely, but force yourself to arrive on a chord tone on beat one of every bar. The fretboard highlights which notes qualify.
Move the whole exercise to one position (frets 3–7 works well) so you stop shifting and start hearing.

Practice this with real lessons

You are looking at the half-step resolutions between G7 and Cmaj7. These lessons work on exactly this kind of movement.

No lesson covers this exact context yet.

No lesson matches this exact context yet.

Related areas in the catalog:

Frequently asked questions

Which scale can I play over the whole ii–V–I in C major?: All three chords are diatonic to C major, so a single C major scale covers the entire progression. That is also its trap: playing one scale through all three chords makes the changes disappear. Use the scale as the note pool and the chord tones as the targets.
Why does G7 pull towards Cmaj7 so strongly?: G7 contains the tritone B–F. B wants to rise a half step to C, F wants to fall a half step to E. Both resolutions land inside Cmaj7, so the chord change resolves two tensions at once.
Do I have to play the chords as 7th chords?: No. Dm – G – C works the same way harmonically. The 7ths just make the guide-tone motion audible, which is why they are the standard voicing for practising this cadence.