Minor 7b5 Chord

Almost fully diminished

Here are ways you will see this notated as symbols:

• Xm7b5
• Xm7-5
• Xø

Xm7b5 is most common and most clear if you do not have a special symbol (ø). It shows us how we get there. We use an Xm7 chord and lower 5. Usually the spelling of this chord is surprisingly standard, although variations do exist. The variations do not affect what we play or hear. In traditional theory the Xm7b5 chord is called a half diminished chord. The symbol ø is a frequently used written short cut but not quite so common when typing due to the difficulty in finding the symbol and making it a superscript.

Half Diminished Chords

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2 thoughts on “Minor 7b5 Chord”

1. Michael says:

Didn’t know that symbol existed, but I do know that the 7b5 chord was Diminished.

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1. No. A diminished chord is the same as a plain 7 chord with the root raised or a plain 7 chord with every note lowered except the root.

For instance, B D F Ab/G# is a fully diminished chord, also written as Bdim7. You can get there starting with a Bb7 chord (Bb D F Ab) then changing Bb to B. Or you can start with a B7 chord (B D# F# A) and lower every note to B D F Ab. Spelling does not matter, so you can write any black note either way. Later there are more rules about spelling that have to do with what the next chord is. This is all about theory, and I’m probably better at theory than anything else, but it’s so hard and takes so much time to teach, and I don’t have enough time in lessons to go over it enough.

A 7b5 chord is completely different. For instance, you go from B7 to B7b5 by lowering one note: B D# F A. G7b5 is G B Db/C# F.

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