A Brief Overview

Insturmental Music in Early Christianity

The Reformation and Iconoclasim and Popery

Insturmental Music During the Reformation

 Dr. Ferguson's A cappella Music in the  Assembly Study Guide

John Calvin vs Frame
John Calvin on the Psalms (Music)

Scottish Dictionary of Church History and Theology, HTML(see below for format easier to read)
Scottish Dictionary of Church History and Theology, (PDF) (This is a large file and it takes a while for it to load but is easier to read.) 

A Note from others Concerning Music