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It may be just out of habit, what with the 12-edo temperament all around us, but anyway: I find the dominant-seventh rendition 20:25:30:36 sounds extremely harsh. In particular, the tritone from the third to the seventh is so wide that it raises suspicions about being just an extremely detuned perfect fifth. Sure, the chord is meant to be dissonant, but like that?

The alternative with a Pythagorean minor seventh 16:9, on the other hand (though requiring higher ratio numbers 36:45:54:64), comes out less jarring. Its tritone is closer to the √2 : 2 we know from 12-edo, which at least makes it much more suitable for tritone-subtitution techniques. Those were after all used a lot in music – not just in Jazz!

What arguments (historical, musical, practical or otherwise) are there, in favour of either of these possibilities? I'd figure there are a lot of considerations about the leading tones etc..


While there are no answers, I tried my best (which isn't very much I'm afraid... overall intonation does not exactly deserve the name "just", but I hope it's good enough to make the issue clear. Anyway...) to contrast the different possibilities.

Here's a simple cadence for string quartet, played six times in a row. Each iteration is identical, except for the V7 chord, which has each time a different ratio of frequencies. It's all the possible ways to do it in random order, with both just and Pythagorean and, for fun, even harmonic seventh (7:4). Each of these was combined both with a just third 5:4, and also with a Pythagorean third 81:64, to make it complete.

Well, for me that has settled the question of what I like best: (Hover cursor to see)

Surprise, surprise! The all-just intonation wins, after all. Within a proper context, it doesn't sound harsh at all but rather "sparkling" and adds the right amount of tension the dominant needs.
The harmonic seventh, as I expected, is right out: it completely undermines the leading melody. The Pythagorean seventh sounds quite ok actually (albeit only together with a just third, otherwise it's much too low in comparison), but it's rather dull compared to the all-just chord 20:25:30:36.

Can you spot which one it is, in the audio file?

1. Pythagorean third, just seventh.
2. Pythagorean third, Pythagorean seventh.
3. Just third, Pythagorean seventh.
4. Pythagorean third, harmonic seventh.
5. Just third, just seventh.
6. Just third, harmonic seventh.

...Of course, that doesn't answer the question though, it's just a personal impression. What I'd like to know is if that's really the generally accepted way to do it.

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To clarify, if one were to edit just the seventh of one particular dominant seventh but leave other pitch relationships intact, then one is screwing up the fifth, third and root of 3 more chords. If you want to "fix" even one other dominant 7th chord, then that's three more chords out the window, not to mention plenty of increasingly sour melodic intervals. Are you talking about some sort of adaptive situation that tunes differently depending on the harmony? –  Pat Muchmore Mar 22 at 23:12
    
@PatMuchmore: Sure I am talking about an adaptive situation that tunes differently depending on harmony. It's not something unusual; at least singers, string instrument players, probably double-reed players and trombonists do this all the time, don't they? It's inherent to just-intonation practise. –  leftaroundabout Mar 23 at 0:14
    
Ok, cool. The question seemed like it was asking about a new temperament to me for some reason. I've played in several brass choirs and string quartets (tbone/cello) but we always did this sort of tuning by ear without discussing specific frequencies. Are you proposing a different sort of correction than is normally sought in these situations? –  Pat Muchmore Mar 23 at 22:57
    
It's rather that I'm wondering which sort of correction it is that players will normally seek to use when playing the V7's minor seventh. I suppose most won't think much about it. The thing is, unlike with the third (where Pythagorean 81:64 is really not nice, but 5:4 is extremely smooth – so it's obvious what to do) the options 9:5 and 16:9 sound really similar on their own so it's hard to analyse what's going on, but the full chord comes out really different. –  leftaroundabout Mar 24 at 1:18
    
Definitely an interesting question, and I wish I had an answer. My groups have always just done it by ear so I'm not sure what we end up with, I suspect it varies pretty substantially. –  Pat Muchmore Mar 24 at 23:53

1 Answer 1

What I have learned from composition and music history, is that regardless of the intellectual aesthetic, what matters when you get to the double bar is what sounds the best.

Composers do not write squiggles down and figure out sounds to fit those squiggles, patting themselves on the back about how clever they are.

Neither should you either fuss with ratios on paper - notation reflects the sounds you hear. Unless you are performing in a period ensemble with period instruments, different music from around the world, or music in which the performative tradition dictates the temperament, or music written in a specific temperament, the best, simplest advice is to follow your ear. If it sounds appropriate to you, chances are it will sound appropriate to someone else.

Besides, there are perhaps only a small handful of musicians in the world who would be upset with your chosen ratio upon initial hearing.

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