John Maxwell was a Scottish author and theologian known for his contributions to both religious literature and music theory. His work 'Presbytery Display'd' published in 1703, provided a detailed examination of the governance of the Presbyterian Church, aiming to instruct occasional communicants on the principles and practices of their faith. This text reflects the theological debates of the time and Maxwell's commitment to clarifying the doctrines and discipline of the Kirk, which were pivotal in the context of the Scottish Reformation. In addition to his theological writings, Maxwell ventured into the realm of music with his 1781 publication, 'An Essay Upon Tune.' This work sought to address the imperfections in musical scales and instrument tuning, showcasing his interest in the intersection of music and mathematics. Illustrated with plates, it provided insights into the technical aspects of music, contributing to the discourse on musical theory during the 18th century. Maxwell's dual focus on theology and music illustrates the breadth of his intellectual pursuits and his desire to enhance understanding in both fields, marking him as a notable figure in the cultural landscape of his time.