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| Oliver Ditson | M | | | |
| Oliver Ditson & Co. | U | | | |
| Oliver Ditson Co. | U | | | |
| E. Oliver | | | I rather would tell them | |
| Edwin Oliver | M | | Lord, we thank thee that thy word | |
| Ellen Oliver | F | | Come, raise your flag, reformers | |
| French E. Oliver | | | Are there within you base passions rife | |
| Gary Oliver | M | | [Hosanna] | |
| George E. Oliver | M | | | SUNSHINE |
| George P. Oliver | M | | Tell me not my lot is sadness | |
| Grace Reed Oliver | F | | My soul has seen a vision of the conquest of the | |
| H. K. Oliver | | | Musing in the silent grove | |
| Oliver & Harkness | | | | |
| Henry K. Oliver | M | 1800 -- 1885 | LORD, you have searched me and you know | FEDERAL STREET |
| J. L. Oliver | | | There's a day that's coming | |
| J. R. Oliver | | | Our lady came to Bethlehem | |
| M. C. Oliver | F | | Christ for thee is interceding | |
| Martha C. Oliver | F | | Dear Savior, I'm thy little child | |
| O. Oliver | | | I've enlisted for Jesus | |
| Richard J. Oliver | M | | Are you heavy hearted, sad and weary | |
| Stanley Oliver | | | This is my Father's world | TERRA BEATA |
| Stanley Oliver | M | | This is my Father's world | TERRA BEATA |
| Oliver W. Clay & Co. | U | | | |
| W. R. Oliver | | | I am satisfied with Jesus every day, For he loves me | |
| Thomas Olivers (1725-1799) | M | 1725 -- 1799 | Louons le Seigneur Dieu | LEONI |
| Karen Oliveto | U | | What are those bells that call to us | TRURO |
| Luis Olivieri | M | 1937 - | Ensanta hemandad (United by God's love) | EN SANTA HERMANDAD |
| W. Randolph Oller | | | If love is in the heart it drives the gloom | |
| E. M. Ollerenshaw | | | From meadow and from garden | |
| B. Ollon | | | Hwad godt kan jag dock goera | |
| F. Ollon | | | Denne 'r den stora dagen | |
| G. Ollon | | | Hwad kan dock min sj'l foernoeja | |
| H. Olmstead | | | Come with us today, O come | |
| Timothy Olmstead | M | | | |
| W. P. Olmstead | | | When floating on [o'er] [in] life's troubled sea | |
| William B. Olmstead | M | 1862 -- 1941 | Lord, I have started to walk in the light | [Lord, I have started to walk in the light] |
| E. M. Olmsted | | | When the Sabbath school bells | |
| F. A. Olmsted | | | When the call has come to gather over there | |
| L. W. Olmsted | F | | He alone my soul redeems | |
| T. Olmsted | | | | |
| J. C. Olpius | | | Herr der Zeit und Ewigkeit, Gib doch, dass ich bis | |
| Alfred Dulin Olsen, 20th C. | M | | Love divine, so great and wondrous | PEARLY GATES |
| E. W. Olsen | | | Now hail we our Redeemer | |
| J. Olsen | | | Vingaardsherre, Pris og 're | |
| M. E. Olsen | | | I adore thee humbly, O thou hidden | |
| Norman P. Olsen | | | When seed falls on good soil | |
| Ren Olsen | F | | Be strong, the command still is ringing | |
| Vesta J. Olsen | | | Journeying through the desert wild | |
| E. W. Olson | | | Who have found so safe a station | |
| Ernst Olson | | | All hail to thee, O blessed morn | |
