What a marvelous article about intonation and temperament. It is one of those expositions that approach perfection in conveying the subject matter. I am no music theorist but rather an engineer with an appreciation for all things wave- or signal-oriented. I will want to read it multiple times to savor the explanations. The author's album based on just intonation is linked in the article ("A Walk Through The Ambient Garden") and I highly recommend it: it is a mesmerizing composition.