What is a Roman Numeral Analysis?

Roman numeral analysis is a system for labeling chords in a piece of music using Roman numerals to indicate their position within a key. It shows the relationship of each chord to the tonic and helps analyze harmonic structure, progression, and function.

In this system, uppercase numerals represent major chords and dominant seventh chords, while lowercase numerals represent minor chords. Additional symbols, such as “°” for diminished chords or “⁷” for seventh chords, provide more detail about the chord quality. For example, in the key of C major, a C major chord is labeled I, an F major chord is IV, and a G7 chord is V7.

Roman numeral analysis is widely used in classical theory, jazz, and modern music education. It helps musicians understand chord function, recognize common progressions, and communicate harmonic ideas clearly. This method allows composers, performers, and students to analyze music in a key-independent way, making it easier to transpose and understand patterns across different pieces.