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Thread: Dim, m7b5 discrepancy

  1. #1
    Registered User Sabby's Avatar
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    Dim, m7b5 discrepancy

    Hi, ive been going over the great articles on major scales by Guni. There's 1 thing im having trouble with though. It seems as if Diminished chords only have 3 notes 1 b3 b5 while your m7b5 has four notes namely 1 b3 b5 b7, correct? My friend showed me what his guitar teacher taught him to be a F#dim (spose you can show dim like this F#o?) as follows :

    e|----2----
    B|----1----
    G|----2----
    D|----1----
    A|----0----
    E|----x----

    I saw this in a chordbook as well. Yet those notes are F# C A D# so um you see the 4 notes a b3 apart which to me logically means a m7b5 chord right? Some 1 care to show me the way much appreciated..

    -Ryan

  2. #2
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    m7b5, and o7... when each one??

    HEY Ryan, first of all excuse my english cause im out of practice.
    Now, if it helps..
    The diminished triad itīs : 1 b3 b5 , but the diminished 7 chord
    is : 1 b3 b5 o7
    The only difference between the diminised chord and the minor 7 flat five itīs that the first one has a diminished seventh instead of a minor one.
    The minor 7 flat five also has a diminished triad-
    What i wanna know, pleeeease, is when you use a diminished 7 chord?? As the diminished 7 is not part of the scale, i wonder if you use it just to give tension to the song, if it rests on the root chord, or what.???
    Thanks
    Love the music

  3. #3
    The Next big thing the1andonly's Avatar
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    sabby, what you're showing is an Adim7, but it could also be F#dim7. these are different than diminished chords, which are 1-3-b5, and a half-diminished m7b5 chord.

    here's how you could change this Adim7 into an A dim:

    (1-b3-b5)
    e--5
    b--1
    g--2
    d--1
    a--0
    e---
    and how to change it into a Am7b5:

    (1-b3-b5-b7)
    e--3
    b--1
    g--2
    d--1
    a--0
    e---

    they are all pretty much used the same. all of these could be used to resolve to a Bb or Bbm chord. but the diminished 7s are my favorite. they have a 1-b3-b5-bb7 chord formula, where every note is a minor 3rd apart. it's symmetrical, so the Adim7 is actually the same as a Cdim7, Ebdim7, and F#dim7. hope this helps.

  4. #4
    Registered User Sabby's Avatar
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    yeah

    Yeah 1andonly that cleared things up quite a bit. Thx for the explanation

    -Ryan

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