Secondary dominant
When a
composer of
music writes in a
key then uses the
dominant of a
chord within that key, this is the use of a
secondary dominant. This is one of the easiest and most facile ways of
modulation.
Example:: C Major: I--V--V/vi--vi--IV--V--I
C--G--E---a min--F--G--C
This example shows the E Major chord that stands as the secondary dominant of a minor--V of vi (the
major V) going to vi (
minor).