tonicisation

theoryTON-ih-sy-ZAY-shunfrom English

The brief treatment of a non-tonic chord as a temporary tonic through the use of its own dominant or‌​‌​‍​‍​‍​‍​‌​‍​‌​‍​‍​‌​‌​‍​‌​‌​‍​‌​‌​‍​‌​‌​‍​‍​‌​‌​‍​‍​‌​‌​‌​‍ leading tone

In Depth

Tonicisation lasts only a chord or two — long enough to confirm a temporary tonic but too brief to establish a new key.‌​‌​‍​‍​‍​‍​‌​‍​‌​‍​‍​‌​‌​‍​‌​‌​‍​‌​‌​‍​‌​‌​‍​‍​‌​‌​‍​‍​‌​‌​‌​‍ It is achieved by introducing the temporary tonic's leading tone, typically through a secondary [dominant](/term/secondary%20dominant) (V/x) or secondary leading-tone chord (vii°/x). If the new tonal centre persists for a full phrase or longer with a cadence, it becomes a modulation rather than a tonicisation. The distinction is one of duration and structural weight.
Did you know?

The difference between tonicisation and modulation is one of the most-debated boundaries in music theory — experts disagree on exactly where one ends and the other begins.

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