- O Christmas Tree
- O Come All Ye Faithful
- O Come, O Come, Emmanuel
- O For A Thousand Tongues To Sing
- O Happy Day
- O Holy Night
- O How He Loves You And Me
- O How I Love Jesus
- O Little Town Of Bethlehem
- O The Deep, Deep Love Of Jesus
- O To Be Like Thee
- O Worship The King
- Oh Where, Oh Where Has My Little Dog Gone?
- Oats And Peas And Barley Grow
- Ob La Di
- Octapus Garden
- Of The Lord
- Oh Boys, Carry Me Long
- Oh Happy Day
- Oh How I Hate To Get Up In The Morning
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- Oh How Lovely Is The Evening
- Oh Lemuel
- Oh Lonesome Me
- Oh Susanna
- Ohio
- Okie From Muskogee
- Old Black Joe
- Old Brass Cannon
- Old Buttermilk Sky
- Old Folks At Home
- Old Habits
- Old Joe Clark
- Old Lamplighter
- Old Mac Donald
- Old Rugged Cross
- Old Sister Phoebe
- Old Time Rock and Roll
- Old Uncle Ned
- On Jordan's Stormy Banks I Stand
- On The Atchison, Topeka and Sante Fe
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- On The Other Hand
- On The Street Where You Live
- On Top Of Old Smokey
- Once In A While
- Once Upon A Time
- One Day At A Time
- One Toke Over The Line
- One, Two, Buckle My Shoe
- Only The Lonely
- Only Trust Him
- Onward Christian Soldiers
- Open Arms
- Open My Eyes That I Might See
- Open Our Eyes Lord
- Operator
- Our Boys Will Shine Tonight
- Our Bright Summer Days Are Gone
- Our God Is An Awesome God
- Our God Reins
- Our Love Is Here To Stay
- Over The Sunset Mountain
- Over There
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