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<small>''also called '''borrowed dominant'''''</small>
The most common borrowed chord is the V (or V7V{{7}}) of V chord, commonly notated as ''V/V'' or ''V7V{{7}}/V''. Basically, if we think of the current key's V chord as a I chord, it is the V chord above that. So for the key of C Major, V is G major. In the key of G Major, V is D major. Thus, in the key of C Major, V/V is D major. Notice, the diatonic chord in the key of C Major with a root note of D is actually D minor, making the V/V D major chord a non-diatonic chord. Similarly, in the key of A Harmonic Minor, V is E major, so V/V is B major. The diatonic chord would be B diminished.
====Function====
=== Other Secondary Harmonies ===
Another common secondary chord is V/ii (or V7V{{7}}/ii). This functions very similarly to V/V - it is a dominant function chord that resolves to the diatonic ii chord from the original key. But rather than proceed directly to the tonic chord from there, it continues along the circle progression to return to tonic:
V/ii - ii - V - I
C Maj. A Dm G C