Did "the Protestant movement... secularizing [of] musical forms" evolve into the liturgical music of the post-Vatican II era of "the so-called 'Devil's Interval' or tritone" which Pope Paul VI rejected for the Vatican Masses, but apparently allowed for Masses outside the Vatican?
Transcript Frans Francken's Death Playing the Violin. In music theory, the tritone came to be known as the devil's interval. Wikimedia Commons Did "the Protestant movement... secularizing [of] musical forms" evolve into the liturgical music of the post-Vatican II era of "the so-called 'Devil's Interval' or tritone" which Pope Paul VI rejected for the Vatican Masses, but apparently allowed for Masses outside the Vatican? Here is some research on this question: - At the same time, the nineteenth century saw the final break of the dogmatic hold which had been squeezing scholarship to death for some four hundred years. The Catholic hold on art, morality, ethics and the humanities crumbled under the assault of Charles Darwin, as, indeed, did other Christian doctrines. The restricted content and context for music had already been breaking down ; the Protestant movement began the process of secularizing musical forms; new trends in rhythm and harmony ...