MusicReasonProgression, Transposition, and Arranging
What is this progression doing, as a whole?
Type a progression and a key. This tool summarizes each chord's function, flags likely cadence points and chromatic events, and labels uncertain analyses honestly rather than forcing a confident-looking summary.
Answer
Your progression text stays in your browser and is never logged, stored, or sent anywhere.
Want to learn more? Keys, Modulation, and Harmonic Direction
Understand
A cadence label here is a bounded pattern match on the final two chords' functions (dominant-to-tonic as authentic, subdominant-to-tonic as plagal, dominant-to-submediant as deceptive, or ending on the dominant as half), not a claim about phrase structure the tool cannot see from a bare chord list alone.
Worked example
C, Am, F, G in the key of C major generates I - vi - IV - V. D7 followed by G in the same key flags an applied dominant (V7/V) rather than a plain diatonic chord, which the summary calls out explicitly as a chromatic event worth noticing.
Method and limitations
This tool composes the same locked parser and Roman-numeral classification as Roman Numeral Analyzer, then adds a bounded cadence check on the final two chords and flags any chord that classified as an applied dominant or modal-mixture borrowing as a chromatic event. It never invents a key context, and it does not attempt a full phrase-level or formal analysis beyond this bounded summary.