Let's play a game

[Wandering Kid]

Cdim= C, D#/Eb, F#/Gb

thats all i need to know. thanks man well...

you know, i never understood why a C7 has a Bb in it since a scale from C doesnt have a Bb in it. the 7th note is a B. and since a Cmaj7 is C, E, G, B it makes me wonder why the hell a C7 is a C, E, G, Bb when a C scale is exactly the same as a C major scale. cuz theres no sharps or flats in a 7 note ascending scale from C.

perfect example.

C6. pure simplicity. C, E, G, A

everything after C7 (aside from the flattened B) makes sense.

C9. C, E, G, (Bb) grrr, D

C11. C, E, G, (Bb) grrr again, D, F

and the same for the 13th plus the 13th note from the root.

so...why the Bb?! why is it different from a Cmaj7, 9, 11, 13?

this is annoying because i keep asking people about this but i get the same answer pretty much all the time 'i dunno, you just have to do it.' either that or somebody fobs me off with bullshit. you wouldnt happen to know would you?