O Love, How Deep (6-173)
O Love, How Deep (6-194)
O Lovely Nightingale (0-934)
O magnum mysterium (2-260)
O magnum mysterium (4-619)
O Man of Sorrow (5-661)
O Mary, Don't You Weep (6-174)
O Master, Let Me Walk With Thee (2-511)
O Master, Let Me Walk With Thee (5-747)
O Menschenkind, du stirbest nicht (4-719)
O Mistress Mine (1-716)
O mon âme (2-766)
O Morn of Beauty (2-839)
O Nata Lux, Light Born of Light (5-926)
O Night Divine (3-625)
O Night of Nights (5-351)
O No, John (0-413)
O Praise the Lord (0-618)
O Praise the Lord with Heart and Voice (5-704)
O Praise the Lord, All Ye Nations (1-229)
O Praise the Name of Christ, the Lord (1-670)
O Praise Ye the Lord (3-491)
O quam gloriosum (0-416)
O Rest in the Lord (2-322)
