7. Common Ground . My understanding is that a half diminished chord (also a minor7flat5) is composed of the root third 5th and 7th. Here is Cm7b5 for example. Thus, in C, the dominant seventh is G 7 (G–B–D–F) and the sixth degree borrowed from the minor scale produces A ♭ –B–D–F. A diminished major seventh chord is a diminished triad with a major seventh, often indicated with °M. Each note interval quality (diminished, minor, major, perfect, augmented) expresses a possible adjustment ie. This step shows the A half-diminished 7th chord note interval names and note positions on a piano diagram. Notation: Cm7b5, CØ, Cm7(b5), or Cmin7b5 If you are trying to make that symbol in BIAB it will default as follows: for diminished chord type d after the chord, for a half diminished chord type h . Diminished 7th A Bdim7 has an added diminished seventh: B – D – F – A♭ The root is B The minor 7th is again decreased by a semitone and hence is equivalent to a sixth (6) - only the theoretical approach is different. The half diminished chord (m7b5) has a minor seventh (7) - it's a m7 chord wth a flat five (b5). a possible increase or decrease in the note pitch from the major scale notes in step 4. Please note that the symbol for the Half-Diminished Chord is a circle with a line through it (i.e., Bb Half-Diminished 7th is Bb ø 7). Half-Diminished Chord Construction and Notation. Half-diminished chords are four-note shapes that contain the interval pattern 1 b3 b5 b7. In his Treatise on Harmony, he observed that three minor thirds and an augmented second make up a chord where the augmented second is such that "the ear is not offended" by it. - 02/10/11 03:50 PM Hi cychan sorry for the late response. Half-diminished chords are also known as minor seven flat five chords (m7b5) because they are built as a minor chord with a flat five (b5). The A is missing in the notes above. Both are based on a diminished triad. A half-diminished 7th chord in root position. Or B D# F# A . Re: B half diminished #7 ? B Half-Dim 7th: We will now add to our chart the Diminished/Minor construction of the Half-Diminished 7th Chord. B Diminished Seventh chord attributes: Interval positions with respect to the B major scale, notes in the chord and name variations: Scale intervals: 1 - b3 - b5 - bb7; Notes in the chord: B - D - F - Ab; Various names: Bdim7 - B Diminished 7; Note about fret numbers: The notes in diminished 7th chords are evenly spaced. A half-diminished seventh chord is a diminished triad with a minor seventh added to the chord and can be indicated with the ø symbol. Therefore, the notes B, D, F, and A make up the B Half-Diminished 7th chord. The diminished chord has a diminished seventh (dim7, °7). The 3rd and 5th are flattened and the 7th is needed to make the chord which will read. Note name adjustments. B D F A or Bø or Bm7b5.