A versified translation of the 150 Psalms into a regular metrical pattern suitable for congregational singing to substantive musical tunes. The metrical-Psalter tradition is one of the substantive Reformed-confessional contributions to Christian worship. Principal historic Reformed metrical Psalters: (1) the Genevan Psalter (final complete edition 1562 under Calvin and Beza's editorial direction; with substantive musical settings by Louis Bourgeois and others; the foundational Reformed metrical Psalter and the basis of the broader Continental-Reformed psalm-singing tradition); (2) the Anglo-Genevan Psalter (1556 by Knox's Geneva refugee congregation; basis of the subsequent Scottish Psalter); (3) the Scottish Psalter (1564 first edition; 1650 final revision, which has remained the substantive Scottish-Presbyterian Psalter to the present day; widely regarded as the finest English-language metrical Psalter); (4) the Bay Psalm Book (1640; the first book printed in colonial America; substantive though somewhat literal-clunky early-Puritan-American metrical Psalter); (5) the Sternhold and Hopkins Psalter (1562; English-Anglican-Puritan metrical Psalter that dominated English Protestant psalm-singing for over a century); (6) Tate and Brady's New Version (1696; substantial Anglican-Puritan revision); (7) Isaac Watts's Psalms of David Imitated in the Language of the New Testament (1719; substantial Anglican-Dissenting Christianized metrical Psalter that shaped much subsequent English-Protestant psalm-singing); (8) contemporary metrical Psalters (the Trinity Psalter Hymnal 2018 of the OPC and URCNA; the Reformed Presbyterian Book of Psalms for Worship 2009; the Cantus Christi 2020 of the CREC; various other contemporary recoveries). The patriarchal-Reformed reader values the substantive metrical-Psalter tradition as one of the great Reformed-confessional contributions to substantive Christian worship.