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What are "necessary accidentals" in secondary dominants?

Posted by tsackett 
What are "necessary accidentals" in secondary dominants?
March 11, 2018 01:38PM
I'm hoping someone can help me with something I don't understand in the intro to Bert Ligon's book "Connecting Chords with Linear Harmony".

In the key of C, A7 would be the secondary dominant of D minor (ii in the key of C). He says the "necessary accidentals" for this are "B flat and C#". I can understand including C#, because it is is the 3rd of A7. However, why B flat?

If it helps, here is the context for this information:

New key area to be tonicized
ii = D minor

Secondary Dominant
A7 (V7/ii)

Necessary Accidentals
B flat and C#

thanks in advance,
Tom
Re: What are "necessary accidentals" in secondary dominants?
March 11, 2018 02:09PM
I think I figured it out. He's talking about the notes in D harmonic minor. I didn't realize that he meant that by moving to D minor, he did not mean the Dm7 you would find in a C scale.
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