Quote:
Originally Posted by SIRIUSB
Secondary Dominants function as passing chords, just like any notes other than A B C# D E F# G# would function as passing or lead tones in the key of A Major.
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They still don't effect the tonal center. Calling them passing chords doesn't do them much justice since not many chords can be said to have structural significance, the first two bars are merely a prolongation of I-IV and bars 4-7 a prolongation of V, so really "passing chord" can apply to almost every chord in a piece of music.