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Tune Names: O
- O Dass Ich Tausend Zungen Haite
- O Du Liebe Meiner Liebe
- O Durchbrecher
- O Filii et Filiae
- O Gott, Du Frommer Gott (Fritsch)
- O How I Love Jesus
- O Jesu Christ, Meins Lebens Licht
- O Jesu, Warum Legst Du Mir
- O Lamm Gottes
- O Lux Beata Trinitas
- O Mensch Sieh
- O Perfect Love
- O Quanta Qualia
- O Store Gud
- O Traurigkeit
- O Worship the Lord*
- Oaksville
- Ode to Joy
- Old Forty-Second
- Old Hundred Fourth
- Old Hundred Seventh
- Old Hundred Thirteenth
- Old Hundred Thirty Fourth
- Old Hundred Thirty-Seventh
- Old Hundred Twenty-Fourth
- Old Hundred Twenty-Seventh
- Old Hundredth
- Old Rugged Cross
- Old Twenty-Fifth
- Old-Time Power (Gabriel)
- Old-Time Power (Rader)
- Olive's Brow
- Olivet
- Olmutz
- Ombersley
- Omni Die
- Once for All
- Oneonta
- Only a Sinner
- Only a Step
- Only a Step to Jesus*
- Only Believe
- Open My Eyes
- Ora Labora
- Oremus
- Oriel
- Orientis Partibus
- Orlington
- Ortonville
- Orwigsburg
- Osborne
- Oslo
- Othello
- Our God Reigns
- Our Lady, Trondhjem