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Secondary Dominant Chords
SECONDARY DOMINANT CHORDS are chords that act as a setup for an approaching chord. They are not technically part of the key. They intensify the impact of the target chord by acting like a dominant chord going to the root of the key. This has a dramatic effect and has been used to great success by songwriters and musicians of all genre.
Hear the difference when the F# minor chord is preceded by it's SEC. DOM C#7: