Processional on OLD HUNDREDTH is a stately and jubilant fanfare-processional based on the historic Genevan tune OLD HUNDREDTH, most widely associated with the text All People That on Earth Do Dwell (Psalm 100). Designed for ceremonial use, this setting combines confident brass writing with organ and choir to support a dignified entrance or festive liturgical moment. The arrangement treats the venerable melody with respect while enhancing it through rhythmic vitality, bold harmonic support, and antiphonal gestures between brass and voices. Scored for mixed choir, brass ensemble, timpani, and organ, the work is suitable for major feasts, festivals, ordinations, confirmations, and other solemn celebrations. While rooted firmly in the hymn tradition, the piece offers a fresh and effective procession that is both accessible and stirring.