If a dominant 7th is the major key of D for example. What would be the minor key and vice versa. If you know, please explain how.

  • Welcome to the site! Note: a dominant 7th is not a major key, or any key at all. A dominant 7th is an interval or chord, relative to a tonic key, which will generally be a major key. Please clarify your question. Perhaps if you give us the whole chord progression you are working with, we can help you get the answer you need, without getting bogged down in too much terminology. Thanks. – Stinkfoot Nov 25 '17 at 4:37
  • I'm having a hard time understanding this question. Is the key in question D major? By dominant 7th, do you mean a 7th chord on the 5th degree, a dominant chord on the 7th degree, or the mixolydian mode? Are you asking about parallel minors? I recommend following Stinkfoot's advice and clarifying + posting whatever example you are working with. – Ye Dawg Nov 25 '17 at 21:44

Not sure what you need here, but a 'dominant 7th' is a chord produced using 1,3,5 and b7 of a scale - like C E G Bb. It cannot be a dominant 7th with a b3 (C Eb G Bb). That's called a m7th.

There's a vagueness about the terminology because we sometimes talk about the dominant of a key. That's made up using 1,3,5,7 , but starting on 5 instead. That's confusing, so really, it's made up with 5,7.9 and 11. In C, that'll be G B D F. Making the dominant chord in the key of C, but that's not C dominant 7th, as explained earlier. That is called G7, Gdom7th, and can also be used as the dominant chord leading to C minor.

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