You are basically adding a 9th to a 7th chord, but there are several types of 9th chords, major, minor etc. check out the link for more details.It doesn't take much to confuse me,so I have a question on ninth chords. Is a dominate ninth the 135 flat 7 and the nine? Or is that the major ninth. how do they differ?
I am a little confused by exactly what you are asking but a Jazz chord would have the b7 add 9 and the Hendrix chord would have the b7th #9 giving a totally different sound with "tension". As the Jazz 9th is mellow sounding. You can still have the 3rd or 5th in either voicing or drop them. Hope that helps. If Hu chimes in he might be able to explain it in another way to you that will help you understand it better.Jonsey, thanks for trying to help. I didn't get all the answers from those sites. I thought about my original question though. The difference between a dominate and Major ninth is the 7th is not flatted in the Major, I think.
Going further, it seems like if you want to talk about flating or sharping,the dominate ninth, one would say a 7th #9 or 7th flat nine, I believe.
Now, when it comes to add NINE, to say a domiant 7th, is one of the notes dropped? Say the fifth?