What English words can render the mystery of that unknown voice that calls out of the deep,- "Onorate 'l altissimo poeta, Torna sua ombra che era dipartita"?
"Emerson and Other Essays"
John Jay Chapman
Its compass was from G to E in altissimo, which she ran with the greatest ease and force, the tones being at once powerful and sweet.
"Famous Singers of To-day and Yesterday"
Henry C. Lahee
This was sent from Serravezza, and Milanesi, when he first made use of it, assigned it to 1517. Gotti, following that indication, asserts that Michelangelo began his operations at Monte altissimo in July 1517; but Milanesi afterwards changed his opinion, and assigned it to the year 1519. I believe he was right, because the first letter, bearing a certain date from Pietra Santa, was written in March 1518 to Pietro Urbano.
"The Life of Michelangelo Buonarroti"
John Addington Symonds