Well I just thought it would get your interest. Dont get connected in the new flat till Monday so cant pick up or post very often at the mo. Been delving into theory since I damaged my lip and had a good lesson yesterday but didnt understand it all. Best sometimes to let something go in order that the lesson moves along but I am still stuck with this, using C for the example:
C9 has a flattend 7th, as does C11, C13 etc. Why? What it there to tell me in C9 that the 7th is flattened? Or is it like Cminor, where I just know the 3rd is flat? And then, C add 9. I should know this but I get very confused. If add 9 is the D added to the C chord, why is C9 different to add 9?
Would also like to apologise to someone on here who asked about what the chords above a melody were for in terms of improv some time ago. I gave the most ignorant and uninformed answer. I now know better and even realise to some extent what I do not know. I hope the poor so and so took more notice of the more informed answers over mine.
But goodness, it is VERY interesting.