An instrumental solo, in the related key of G major, serves as a verse.

It may be composed in a different but related key, for example.

Given a major key tonic (I), the related keys are:

For example, a fugue may not even explore the dominant, one of the most closely related keys to the tonic.

The Classical forms, by definition, involved juxtaposing musical materials written in related keys.

A closely related key can be defined as one that has many common chords.

Less closely related keys have two or fewer chords in common.

The most common modulations are to closely related keys.

The primary key data can always be modified, even with databases that do not support cascading updates across related foreign keys.

Switches from one key to another are often found between related keys.