It is a true statement that a secondary dominant chord acts just like it is the V7 chord of some chord other than the tonic of the key it is used in because it precedes a sounds like a new tonic to the listener.
It refers to any altered chord that is having a dominant or leading tone relationship to a chord in the key other than the tonic. This chord is usually a chord that contains at least one tone that is foreign to the key.
Most time, the secondary dominant is when a dominant 7th chord acts as a V chord of a diatonic chord other than the tonic it is used for and by using the secondary dominants results in the tonicization of the chord of resolution. Therefore, It is a true statement that a secondary dominant chord acts just like it is the V7 chord of some chord other than the tonic of the key it is used in.
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