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In music, the three-key exposition is a particular kind of exposition used in sonata form.

Normally, a sonata form exposition has two main key areas.

The first asserts the primary key of the piece, that is, the tonic.

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The second section moves to a different key, establishes that key firmly, arriving ultimately at a cadence in that key. For the second key, composers normally chose the dominant for major-key sonatas, and the relative major (or less commonly, the minor-mode dominant) for minor-key sonatas.

The three-key exposition moves not directly to the dominant or relative major, but indirectly via a third key; hence the name.

Examples

• A very early example appears in the first movement of Haydn's String Quartet in D major, Op.

  17 No. 6: the three keys are D major, C major, and A major. (C major is prepared by a modulation to its relative minor A minor, which happens to be the dominant minor of the original key.)

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