I–vii°–vi–V: Leading-Tone Tension
The diminished vii° chord is tiny but powerful because it is built from leading tones. In C major, Bdim shares tones with G7, so it behaves like a dominant flavor without the full weight of a V chord. Moving C–Bdim–Am creates a smooth, stepwise bass line (C–B–A) that feels like the harmony is leaning forward even in a pop context. That makes it great for intros, pre-choruses, or any spot where you want momentum without changing the rhythm section. To make it sing, keep common tones ringing: C can stay on top through C and Am, while Bdim gives you a moment of bite. On guitar, a small Bdim grip works well between open C and Am shapes. On keys, voice Bdim close and resolve it gently into Am; the half-step motion is the emotional hook.
- Key
- C major
- Tempo
- 110 BPM
- Groove
- rock
Play it on guitar
Start slow, keep your right hand steady, and aim for clean changes on the downbeats. Once it’s comfortable, add a groove and increase tempo.
Capo suggestion: try capo 0 and play in C shapes for open chords.
Chords: C – Bdim – Am – G
Roman numerals & theory
Roman numerals describe the chord’s function relative to the key. This helps you transpose the “shape” to any key without memorizing new chord names.
In C major: I–vii°–vi–V
Variations (keep the progression, change the feel)
- • Add 7ths for color (try maj7 on I, m7 on vi, and V7 before resolving).
- • Use a sus4 resolve on the V chord (e.g. Gsus4 → G) to create tension and release.
- • Change the rhythm instead of the chords: try anticipations (hit the next chord on the “and” of 4).
- • Arpeggiate the top notes to create a hook while the harmony stays the same.
- • Borrow a darker chord for contrast (in a major key, try iv for one bar before returning).
Related
FAQ
Select a chord below to start building your progression