A diminished seventh chord is a diminished triad (which has a root note, a minor third, and a diminished fifth) with a seventh interval added above the root:
◊ Diminished 7th
An F♭dim7 has an added diminished seventh: F♭ – A♭♭* – C♭♭ – E♭♭♭**
◊ Half-Diminished 7th
An F♭ø has an added minor seventh: F♭ – A♭♭ – C♭♭ – E♭♭
• (also called a “minor seventh flat five”)
◊ Diminished Major 7th
An F♭°M7 has a major seventh: F♭ – A♭♭ – C♭♭ – E♭
* see double-flat
** a triple-flat lowers a note by three half-steps. E♭♭♭ is enharmonically equal to D♭.
♫ More Bass Chords:
Fbmaj ▪ Fbma7 ▪ Fbma9 | Fbmin ▪ Fbm7 ▪ Fbm9 | Fbdim ▪ Fb°7 | Fbaug ▪ Fb+7 | Fbsus2 ▪ Fbsus4
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