A#m7b5

A# half-diminishedNotesA# C# E G#Formula1 b3 b5 b7

The half-diminished chord, also written m7b5 or ΓΈ, is a diminished triad with a flat seventh. It is the ii chord in a minor key, so you meet it all the time in jazz progressions like Bm7b5 to E7 to Am.

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