The technique of introducing key changes between keys which are not conventionally related to each other or to the home key, especially so that a piece ends in a key other than the home key; the employment of this technique.
Origin
1940s.
Definition of progressive tonality in US English:
progressive tonality
noun
Music
The technique of introducing key changes between keys which are not conventionally related to each other or to the home key, especially so that a piece ends in a key other than the home key; the employment of this technique.