The Intonation of the Major Third
At the conservatoria, I often encounter singers and conductors arguing that the major third should be intonated low. The reasoning behind this claim is as follows. Modern instruments are tuned according to the equal temperament. In that system the major third is higher than the just third according to the overtones. That is, a just third a lower than the equal temperament third. And – according to this line of thought – a just third is ‘more natural’ than an equal tempered third and it sounds purer and better. Thus, the conclusion is that major thirds should be intonated low. In the same train of thought we should intonate minor thirds high.