Articles on biblical principles of worship, the singing of Psalms in worship, Sabbath observance and the sacraments.

William Young

The Second Commandment
The Puritan Principle of Worship

G. I. Williamson

An examination of Scripture teaching about how God should be worshipped:
The Scriptural Regulative Principle of Worship

A widely-read booklet on Psalm singing:
The Singing of Psalms in the Worship of God

Other articles on music in worship:
Trinity Hymnal, or the Content of the Book of Praise in the Orthodox Presbyterian Church
Instrumental Music: Commanded or Not Commanded?
Renewal of Scriptural Worship

John W. Keddie

The argument for singing the biblical Psalms in worship:
Sing the Lord’s Song! Biblical Psalms in Worship

Sherman Isbell

The nature of worship in the New Testament:
Hear Ye Him

A study on the regulative principle and worship song, including an examination of Calvin’s view respecting the singing of Psalms:
The Singing of Psalms

On headcoverings in worship:
Headship and Worship: Notes on 1 Corinthians 11:2-16

David Murray

The Scottish Communion Season