In music theory, a secondary leading-tone chord or secondary diminished seventh (as in seventh scale degree or leading-tone, not necessarily seventh chord) is a secondary chord that is the leading-tone triad or seventh chord of the tonicized chord, rather than its dominant.
What are secondary dominants and secondary leading tone chords?
A secondary dominant is an altered chord having a dominant or leading tone relationship to a chord in the key other than the tonic. An altered chord is a chord containing at least one tone that is foreign to the key. Using secondary dominants results in the tonicization of the chord of resolution.
What are the 3 secondary chords?
How to work out the Secondary Chords. Similarly to primary chords, it's really easy to work out the secondary chords in any key – they are the triads built on notes II, III and VI. So, in C major the secondary chords are D minor (II), E minor (III) and A minor (VI).