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Thread: The Dominant 7th Chord

  1. #1
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    The Dominant 7th Chord

    How come in the key of Ab that Eb7 has a minor third in it? Am I wrong going about it this way.

    Eb7 = Eb G Bb Db

    I try to analyze the interval structure of the chord.

    Like I know that Eb to G is a major third but Bb to Db is a minor third am I wrong on this or something

  2. #2
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    All dominant 7th chords will have the same "stacked" intervallic structure of M3+m3+m3

    C7 = C E G Bb

    C-E = major 3rd
    E-G = minor 3rd
    G-Bb = minor 3rd

  3. #3
    Registered User Malcolm's Avatar
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    Quote Originally Posted by dwest2419 View Post
    How come in the key of Ab that Eb7 has a minor third in it? Am I wrong going about it this way.

    Eb7 = Eb G Bb Db

    I try to analyze the interval structure of the chord.

    Like I know that Eb to G is a major third but Bb to Db is a minor third am I wrong on this or something
    All that major 3rd, perfect fifth, etc. I found to be confusing so I went another way. Offered for what it is worth.

    C scale = C, D, E, F, G, A, B, C
    Degree.....1, 2, 3, 4, 5, 6, 7, 8 The 1 is often written as a R signifying the root, helps with generic patterns.

    Basic Chords
    • Major Triad = R-3-5, C chord = C E G
    • Minor Triad = R-b3-5, Cm chord = C Eb G
    • Diminished Chord = R-b3-b5, Cdim = C Eb, Gb

    7th Chords
    • Maj7 = R-3-5-7, C chord with a B added for a Cmaj7 chord.
    • Minor 7 = R-b3-5-b7, Cm chord with a Bb added for a Cm7 chord.
    Dominant 7 = R-3-5-b7, C chord with a Bb added for a C7 chord.
    • diminished = R-b3-b5-b7, Cm7 with a Bb added for a Cm7b5 chord or C chord with the little 0 with a strike through.
    • Full diminished = R-b3-b5-bb7, Cm7 with a Bbb added for a C chord with the little 0 no strike through.

    Check this out. http://www.smithfowler.org/music/Chord_Formulas.htm

    Which ever way suits you best. A dominant seven chord is a major chord with a b7 added.
    Last edited by Malcolm; 07-07-2012 at 02:44 AM.

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