The universal language of progressions · I ii iii IV V vi vii°
Why functional Roman numerals beat chord letters — and how to read every inversion, extension, and secondary dominant.
Editorial content for this topic is in progress. The interactive player and pattern data are live below.
Hear the pattern
Interactive player — try the progression in any of the 18 keys, switch modes, and adjust tempo to find the feel you want.
C
D
E
F
G
A
B
C
D
E
F
G
A
B
I›C
100 BPM
FormulaI ii iii IV V vi vii°
FunctionSee "About" below for harmonic role.
Soundits scholarly, text-like precision
Common inUsed in every classical analysis · Nashville Number System variants · Jazz lead sheets
FamousUsed in every classical analysis · Nashville Number System variants · Jazz lead sheets
The ivory paper and ink palette on this page is inspired by music-color synesthesia — roman numerals maps to ivory paper and ink, reflecting its scholarly, text-like precision.
About Roman Numerals
Why functional Roman numerals beat chord letters — and how to read every inversion, extension, and secondary dominant.
Variations
Variation
Another way the pattern shows up in real music.
C
D
E
F
G
A
B
C
D
E
F
G
A
B
I›C
70 BPM
Variation
Another way the pattern shows up in real music.
C
D
E
F
G
A
B
C
D
E
F
G
A
B
ii7›Dm7
110 BPM
Famous songs & pieces
Used in every classical analysis
Nashville Number System variants
Jazz lead sheets
Frequently asked questions
What is a roman numerals progression?
Why functional Roman numerals beat chord letters — and how to read every inversion, extension, and secondary dominant.
How do I use this on the piano?
Start with the player above in C. Once the pattern is in your ear, transpose to the keys you actually play in. The Roman numerals stay the same; only the chord names change.