Songs of the Spirit can be purchased from Peter and Rachel Reynolds Books. It is £5 and the proceeds go to hospices in Scotland. Estimated postage costs are: USA (0-7): £1.80; USA (8-9) & Rest of World including EU: £3.30
A sample chapter is here. View Sample
Songs of the Spirit is an important study on the subject of praise. We need sound teaching on biblical worship. The worship that God commands from us, rather than that which we choose to give to Him. A variety of authors from various Churches have contributed to this volume. They share a common conviction that we must worship God in the songs that He Himself has inspired. “It is the conviction of all who contribute to this book that the recovery of earnest, intelligent and spiritual unaccompanied singing of Psalms in the praise of the church is a major part of the repentance and renewal so badly needed in the church today.”
Another publication called Reformed Worship may also be of interest. It is £1. View Sample
Reformed Worship is a vital guide to 
worship. Nothing is more sacred and more important than the worship of God. The Bible must have the pre-eminent place in our worship services. But how should a service of public worship feel and sound when the Word of God has central place and reverence for God governs everything? This booklet describes a service of reverent worship grounded upon Scripture principles. It will be helpful for those who conduct public worship as well as those seeking for worship that truly honours God. It will have a hearty reception where there is a sincere desire to know how to worship God in spirit and in truth. It is extracted and updated from an older publication called The Directory of Public Worship. This updated extract is in no way meant to replace the original authoritative document. Instead, it shows its abiding relevance and may encourage many to read the original for themselves.
Thanks to Matthew Vogan for sending this information along!
Exclusive Psalmody 