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Jul 2 at 16:58 comment added supercat @musicamante: While music itself would have been engraved, a lot of material talking about music would have been set with systems using lead type or other limited technologies. Someone publishing a music theory text would have preferred to use, within body text, characters that were available in fixed type form.
Jul 2 at 16:47 comment added musicamante @supercat I don't know about that (also, turning "e" upside down may not always be an option, as the character descent may not be identical), but I doubt it would matter much in notation or music theory, especially considering that the most common printing system used before computer printing was done with engraving, not with movable types. In the digital era, available characters may be chosen for convenience (eg # in place of ♯), but extended character sets were not commonly available until the wide diffusion of utf and fonts supporting them.
Jul 2 at 14:58 comment added supercat @musicamante: I wonder if the availability of shapes in lead type affects things in the way it affected the design of the International Phonetic Alphabet (a typesetter who needed to produce schwa, for example, could literally take a piece of lead type for an "e" and turn it upside-down). A triangle could be reproduced as a Greek delta, and a slashed circle could be reproduced as a Danish ø, but I don't know if typographers would have had a slashed diamond available.
Jul 2 at 2:33 comment added musicamante @Tim Just an idea that came out of my mind while thinking about it: considering that diminished chords, by extension, equally "split" both the circle of fifths and that of half-tones (and, interestingly enough, a standard keyboard, geometrically speaking), the result is always "circular". It may be a "ret-con", but it makes sense :-) The slash for half-diminished therefore makes sense (since it "adds a split" to the subdivision, even if it's not conceptually at its "half", at least in its "fundamental" state, as it's slightly after its half-way around).
Jul 1 at 20:02 comment added supercat @Tim: I dunno. A diamond square with a point at the bottom) would shape would probably make the most sense, but a circle might be easier to draw. I'm not sure whether a slashed circle for half-diminished seventh appeared before or after the circle for a diminished triad, or circle 7 for a full diminished 7th chord.
Jul 1 at 17:49 comment added Tim @supercat - great, now explain o for diminished...
Jul 1 at 17:24 comment added supercat @Tim: If one spaces twelve tones equally around a circle, the three notes of a stacked pair of major thirds (as occur between the third, fifth, and seventh of a major seventh chord) will be the vertices of an equilateral triangle.
Jun 29 at 14:42 comment added John Belzaguy @Tim I can’t say for sure but it is a jazz/contemporary origin, probably Berklee College of Music.. They have been using triangle for major and dash for minor for decades, but mostly for chord changes.
Jun 29 at 10:42 comment added Tim Never come across triangle for major, except maj7 chords. Where's it from?
Jun 29 at 5:21 comment added John Belzaguy @musicamante Turkey leg is my favorite key.
Jun 28 at 23:34 comment added musicamante And, well, of course there are always alternate and perfectly valid methods for learning guitar...
Jun 28 at 23:26 comment added musicamante Technically speaking, I believe that the appropriate terms for raised and lowered should be augmented and diminished.
Jun 28 at 22:26 comment added John Belzaguy @temporary_user_name No problem. Remember, 4ths and 5ths are neither major or minor. They can be either perfect, raised, or lowered.
Jun 28 at 22:17 comment added temporary_user_name Ah okay thanks. I am familiar with m/M but have never seen triangle/p.
Jun 28 at 21:37 comment added John Belzaguy @temporary_user_name The triangles mean major. Major and minor intervals are usually represented by upper and lower case m’s. M3 = major 3rd and m3 = minor 3rd. In this diagram they used triangles for major intervals. The p’s mean perfect, used for perfect 4th and perfect 5th intervals.
Jun 28 at 21:22 comment added temporary_user_name What are the triangles and p's in the notation in that image? I haven't seen that before.
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