In a message dated 96-04-16 18:58:40 EDT, you write:
>I think that that (2^(6/12) in equal-tempering) is part >of what's known as the Devil's Triad, AKA a diminished 7th; >at any rate, a nice refernce is _The Myth of Invariance_ >by McSomebody. > >
I've never heard of the Devil's Triad, but the Devil's interval is an augmented fourth (or diminished fifth: they're the same in the tempered scale). The ratio is 2^(6/12). It's the interval you hear in the solo violin at the beginning of Saint-Saen's Danse Macabre.