MusicReasonProgression, Transposition, and Arranging
How could I get from this key to that one?
Choose a source and destination key. This tool compares bounded, explainable routes between them, showing every intervening chord or key relationship, never promising a smooth modulation.
Answer
Want to learn more? Keys, Modulation, and Harmonic Direction
Understand
A common-chord (pivot) modulation works by finding a chord that belongs diatonically to both keys, using it as a hinge before revealing the new key through chords unique to it. Some key pairs share no such convenient chord, in which case a more direct or chromatic move is the remaining bounded option this tool offers.
Worked example
Moving from C major to G major offers a common-chord route: C major itself is the I chord in C and the IV chord in G, a natural pivot between the two closely related keys. Choosing the same key for source and destination correctly reports that no modulation is required.
Method and limitations
The tool compares every diatonic triad of the source key against the destination key's diatonic triads by pitch class and quality, listing every match as a pivot-chord candidate. This launch scope covers major-to-major key pairs with a common-chord check and a direct fallback only; it does not enumerate every historical modulation technique.