B Flat Half-diminished (also written A#m7b5)
Bbm7b5 is made of 4 notes: Bb, Db, Fb (E) and Ab. Here it is in root position, with Bb at the bottom.
Inside Notley Piano: all the inversions of Bbm7b5, fingering for both hands, a play button, and practice that helps you remember it.
| Note | Degree | Interval from Bb |
|---|---|---|
| Bb | 1 | root |
| Db | b3 | minor 3rd |
| Fb (E) | b5 | diminished 5th |
| Ab | b7 | minor 7th |
A half-diminished chord (minor 7 flat 5) is a diminished triad with a minor 7th. It sounds moody and searching, and is the "ii" chord of a minor-key ii-V-i in jazz.