He discussed the numerous pitches in use before and during his time, but the only one that he mentioned as being a fourth below choir pitch he considered obsolete and suitable only for plainsong.
"Italian Harpsichord-Building in the 16th and 17th Centuries"
John D. Shortridge
And Winchester, too, has all and more than all, the surprise of the plainsong; the better you know it the more you are impressed.
"England of My Heart--Spring"
Edward Hutton
There is much bustle and preparation; the travellers are welcomed with monkish hospitality; Christopher, we may be sure, goes and hears the convent singing Compline, and offers up devout prayers for a quiet night and for safe conduct through this vale of tears; and goes thankfully to bed with the plainsong echoing in his ears, and some stoic sense that all days, however hard, have an evening, and all journeys an end.
"Christopher Columbus, Complete"
Filson Young