The Reformed-confessional worship position that only the 150 inspired Psalms (and in some forms other canonical songs such as the Song of Moses, Mary's Magnificat, etc.) are to be sung in the public worship of God. The position has been historically held in the Scottish-Presbyterian and Reformed-Presbyterian traditions (the Reformed Presbyterian Church of North America, RPCNA; the Free Presbyterian Church of Scotland; and various smaller Reformed-Presbyterian bodies) and was the substantive position of Scottish Presbyterianism from the Reformation through the late nineteenth century. The substantive theological grounds: (1) the regulative principle requires positive scriptural command for worship elements; the singing of inspired psalms is positively commanded (Colossians 3:16; Ephesians 5:19; James 5:13; Psalm 95; 100; etc.); the singing of uninspired human compositions is not positively commanded and therefore is not warranted by the regulative principle; (2) the Psalms are the divinely-inspired praise-book of God's people, comprehensively suitable for every season of the believer's life and the church's life; (3) singing uninspired human compositions risks introducing doctrinal error and unauthorized content into worship. The substantive Reformed-confessional response from the broader hymnody-permitting tradition (the majority Reformed-confessional position in the contemporary world): the regulative principle commands the substantive activity of praise singing without restricting the inspired-Psalter content; the apostolic phrase psalms and hymns and spiritual songs (Colossians 3:16; Ephesians 5:19) substantively permits both Psalms and other songs; the universal church's substantive practice has substantially included non-Psalm hymns from the patristic era onward. The patriarchal-Reformed reader engages the substantive intra-Reformed discussion with appropriate care; both positions are held within the broader Reformed-confessional tradition with substantive theological-pastoral integrity. The contemporary recovery of psalm-singing in Reformed-confessional churches (the metrical Psalter, the singing of psalms alongside hymns) is substantively valuable regardless of which side of the exclusive-psalmody debate a particular church holds.