Eric Routley, The Church & Music, who has been my primary source for the history of church music, and has therefore been quoted most profusely, is also author of Church Music and Theology.  Ordained as a Congregationalist minister, he is currently a minister of the United Reformed Church.  He is Mackennal Lecturer and tutor in Ecclesiastical History at Mansfield College, Oxford, England; and a Lecturer and composer of church music. 

E. Digby Baltzell, author of Puritan Boston and Quaker Philadelphia, a nearly 600-page book, is a native Philadelphian.  He is also author of both Philadelphia Gentlemen and The Protestant Establishment.  He is a Professor in the departments of Sociology and History at The University of Pennsylvania. 

Percy A. Scholes, whose intensive, inclusive book, The Puritans and Music, written steadily over a period of two years in order to set the historical record straight about the subject, and has set me straight as well, is also author of the Oxford Companion to Music, and The Mirror of Music.  He was an extension lecturer at Oxford, Cambridge, and Manchester Universities.  An encyclopedist, an eminent English writer on music, he received an Honorary A.R.C.M. Doctorate from Oxford.

Francis A. Schaeffer, author of How Should We Then Live? and The Church at the End of the 20th Century, The God Who Is There, and Escape From Reason among many other books, is a well known Philosopher, Theologian, lecturer, author, counselor, and founder of L‘Abri Fellowship in the Swiss Alps. 

These authors have done the very extensive, voluminous research and scholarly, analytical work in culling the centuries of documentation I would have had to do on my own.  That is why such authors exist and why such books as theirs are written.  I am indebted and grateful for the time it has saved me.  I have gone into this with a point of view and have refocused it when convinced by differing, substantiated facts (such as that about the Puritans).  And, although we may not necessarily agree on certain specifics in musical practice, I feel confident in the information obtained from them and in their general conclusions in other matters that concern me, because of how well they concur with my own experience and conclusions.