Substitute and Secondary Dominants in Minor Scales

Chords, scales, harmony, melody, etc.
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Some stuff I've been playing with. I haven't seen anything other than vague references to this topic before so consider it very speculative. If anyone can point me at any literature I'd be grateful.

Key of C, romans and function

Natural Minor
Sub

Db7, E7, Gb7, A7, B7
bII7, III7, bV7, VI7, VII7
sV7/i, sV7/bIII, sV7/iv, sV7/bVI, sV7/bVII
Sec
C7, D7, Eb7, F7, Bb7
I7, II7, bIII7, IV7, bVII7
V7/iv, V7/v, V7/bVI, V7/bVII, V7/bIII

Melodic Minor
Sub

Db7, E7, Gb7, Ab7, Bb7
bII7, III7, bV7, bVI7, bVII7
sV7/i, sV7/bIII, sV7/IV, sV7/V, sV7/vi
Sec
C7, D7, A7
I7,II7, VI7
V7/IV, V7/V, V7/ii

Harmonic Minor
Sub

Db7, E7, Gb7, A7
bII7, III7, bV7, VI7
sV7/i, sV7/bIII, sV7/iv, sV7/bVI
Sec
C7, D7, Eb7
I7, II7, bIII7
V7/iv, V7/V, V7/bVI
Last edited by nuffink on Wed Jan 10, 2007 5:56 pm, edited 5 times in total.
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How about F7 as a Secondary Dominant in C Natural Minor (V7/bVII)? Maybe you could also make a list of Dominant chords you can't play (are there any?) in those modes.

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Absolutely! It was bugging me that the natural minor only had 4 when major has 5. I can't believe how I missed that. Thank you.

Did you work it out or do you have a source?
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I just worked it out. I was going through the chromatic scale to see if there are any notes you couldn't play as Tritone Substitute or Secondary Dominants and noticed the F7 was originally not on your list. One other typo: you have the Db7 listed as a II7. It should be bII7.

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Yep. A misprint cut and pasted. Ta again.
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