Hi David (et al.):
In sheet music convention there is no difference whatever between
Cdim and Cdim7. Many people like you and I like to include the 7
to be unambiguous, but nothing can be done about Cdim
except to write it as Cm(b5) if the triad is desired.
Though its usage is hardly widespread, I much prefer Cdim5: this more
clearly articulates the real function of the chord, rather than
suggesting that it's a "minor triad with lowered fifth".
[ Another bonus I just noticed: fewer symbols/keystrokes! :) ]
Quick recognition is the whole purpose of chord names of this type.
Agreed!
The difference between jazz chords and sheet music chords is
only in the accretion of cryptic symbols, of which the triangle is
the worst.
In my opinion, you just contradicted yourself: speaking from my own
experience — as well as opinions gleaned from several discussions
regarding this exact symbol with colleagues and students — the
triangle provides the quickest recognition of any other notation I've
encountered. I believe this happens because (again) the triangle
becomes a transparent metaphor/symbol for *harmonic function*, as
opposed to a set of semantic symbols that one must first parse. [Of
course, as with literally any symbol (e.g., even the 'min' in 'Cmin')
there is a first-occurrence learning curve… but I'm talking about
usage after first contact.]
Regards,
Kieren.
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