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Rh augmented fourth, or mi contra fa, of which the old theorists used to say 'diabolus est.']

Guido d'Arezzo (or Aretinus), in his Micrologus (about 1024), named the six notes of the Hexachord (e.g., C, D, E, F, G, A), thus—Ut, Re, Mi, Fa, Sol, La. These were the first syllables of certain words in the Hymn for the feast of St John Baptist, the words and tune of which are in Hawkins, p. 163.

A rough translation of which is—

'That thy servants may be able with free hearts to sound forth the wonders of thy deeds; release us, O Holy John, from the guilt of a defiled lip.'

In the ancient tune of this verse, the notes assigned to the syllables in capitals were successively those of the scale, C, D, E, F, G, A, and these same syllables were still used in singing in the 16th century. It was noticed, however, that the scale could be easily expressed by fewer names, and accordingly we find Christopher Sympson (1667) saying, in his 'Compendium,' that Ut and Re are 'superfluous, and