chord question

[ponchete]

I am a newby and I am learning new chords. I have a question: is A7b9 the same chord as a Bb07? thanks for your help if you can answer that question. Have a wonderful weekend.

[fep]

The notes of a Bbo7 are Bb Db Fb Abb but...

The notes of Bbo7 spelled enharmonically are Bb C# E G

A7b9 is A C# E G Bb

So you can see they have 4 notes in common.

Guitarists often play an A7b9 with no root which is Identical to Bbo7

However a bass player anchors on the A for A7b9 and the Bb for a Bbo7, very different.

[Reg]

Fep has you going in the right direction... Each Dim.7th chord has two tritones. In your ex. Bbdim7, 1) Bb to E(Fb) and 2) Db(C#) to G(Abb). Each tritone has two possible dom7th chords, buy inverting the notes, so from Bbdim7 you can get from 1st tritone Bb and E you have; F#7b9 and C7b9. Using 2nd tritone of Db and G you get A7b9 and Eb7b9. The most common choice when comping is to use the V7b9 chord of where your going, can be preceded with II-7b5. Example; your Bbdim7 is going to B-7, use C#-7b5 - F#7b9/ B-7. Best Reg

[Sailor]

I like to think of a dim chord as a rootless Dom 7...like C# dim is the same as a rootless A7b9. Does that make sense??

Sailor

[Reg]

Hey Sailor...Yes it makes sense, that's usually one of the first choices. That version is natural derived from Harmonic Min. The 7th degree is a dim7th chord and if you backtrack in 3rds to the V chord you have V7b9, ( also b13). So our ear is very use to hearing that sound. When you use the Dim7 as an Ascending Passing Dim. chord, usually half step approach, it functions as either a secondary Dom. of expected target chord or a chromatic function chord with traditional voice leading. In jazz it's usually a secondary Dom. as in using your C#dim7 going to D-7. You could use your A7b9, voiced any way you choose. There are more choices and different ways to analysis etc... but your choice covers most tunes. Reg

[ponchete]

Great, thank you guys, those answers really helped me,

[Sailor]

Thanks Reg...I'm starting to see and figure things out!!

Sailor