A13?

this bit of theory confuses me slightly as so much theory does but there you go, im quite slow at picking up writen stuff .If you follow the interval structure in the key of A. The thirteeth of the chord A13 is difficult to understand for me with the augmented stuff as you get past the octave .Is it wise and just keep going minor, major. Example once you reach the octave why not carry on minor ninth, major ninth, MINOR TENTH,MAJOR TENTH istead of augmented ninth and eleventh because going by the writen inteval stucture the chord A13 is d# isnt it? but im seeing G. Someone who knows about intervals please explain the concept for me to get my head around please THANKS

a 13th chord contains the intervals 1, 3, 5, b7, 9, 11, 13.

In A, that would be the notes A, C#, E, G, B, D#, F#.

I'm not sure what you mean when you say about "augmented stuff". All the intervals are the normal major intervals except for the flat 7th. If it was an A13#11 chord for example then there would be an augmented 11th which is a D## (which is an E in other words), but in A13 there are no augmented notes.

To expand on the qualities of the intervals (Augmented, diminished, Major, minor, perfect...) to see what the intervals actually are Blackholesun said,

P1 M3 P5 m7 M9 P11 M13

The only note in this chord that has been adjusted from it's tonic's Major scale is the 7th It has been lowered half a step to a minor.

yup, I should have said "...uses the scale degrees 1, 3, 5, b7, 9, 11, 13".