Let's play a game

[Blank]

Are you guys sure that a C7 is even in the scale of C? Bb kinda makes me think that its the V7 of F which makes sense CEGBb would be what you would use is you wanted the V7 of the I in Fmaj...

But i could be wrong im use to the Roman numerals!! The whole guitar theory/ jazz theory system...not sure what to call it is a bit different than what im use to...

As for Diminished: A diminished triad consists of a minor third and a diminished fifth above the root, or two minor thirds from the root upward
(ie-E-Ab-Cb known as a Diminished fifth[d5])

As for Augmented: Am augmented triad consists of a major third and an augmented fifth above the root, or two major thirds from the root upward.
(ie- E-A-C# known as an Augmented fifth [A5])

Also note you can invert a d5 and get an A4....

peace
Blank