- O Charlie Is My Darling
- O Come All Ye Faithful
- O Come Come Away
- O Du Lieber Augustin
- O God Our Help In Ages Past
- O How Kindly Hast Thou Led Me
- O Jesus Thou Art Standing
- O Lord Correct Me
- O Lovely Day O Happy Day
- O Paradise
- O Pretty Polly
- O Sole Mio
- O Tender Moon
- O Thou Joyful Day
- O Wert Thou in the Cauld Balst
- O Whisper What Thou Feel
- O Whistle And I’ll Come To You
- O Would I Were A Boy Again
- O Wrap The Flag Around Me Boys
- O Ye Tears
- Ode For Decoration Day
- Oer My Head
- Of That Dark Scaffold
- Oft In Danger Oft In Woe
- Oft In The Stilly Night
- Oh Boys Carry Me Long
- Oh Dear What Can The Matter Be
- Oh Dem Golden Slippers
- Oh For A Thousand Tongues
- Oh Gladly Now We Hail Thee
- Oh Happy Day That Fixed My Choice
- Oh Hush Thee My Baby
- Oh Lemuel
- Oh Lord Oh My Lord
- Oh Mother Take The Wheel Away
- Oh My Darling Clementine
- Oh Susanna
- Oh Tell Me How To Woo Thee
- Oh The Land That We Love
- Oh Touch The Harp
- Oh! What a Pal was Mary
- Oh You Little Darling
- Old Black Joe
- Old Dog Tray
- Old Easy Chair By The Fire
- Old Folks At Home
- Old Hundred
- Old King Cole
- Old Pal (Why Don’t You Answer Me?)
- Old Rosin The Beau
- Ole Dan Tucker
- Ole Shady
- On Billow Rocking
- On On On The Boys Came Marching
- On The Rocks By Aberdeen
- On Venice Waters
- On Yonder Rock Reclining
- Once I Saw A Sweet Brier Rose
- One Heart One Mind
- One Sweetly Solumn Thought
- Only A Face At The Window
- Only A Lock Of Her Hair
- Only To See Thee
- Onward Christian Soldiers
- Our Baby
- Our Flag Is There
- Our Flag Oer Us Waving
- Our Land O Lord
- Our Little Nipper
- Our Mothers Way
- Out Of The Window
- Over The Banister
- Over The Bright Blue Sea
- Over The Garden Wall
- Over The Stars There Is Rest
- Over The Summer Sea
- Ox Minuet
- The Oak And The Ash
- The Old Arm Chair
- The Old Cabin Home
- The Old Familiar Place
- The Old Oaken Bucket
- The Old Sexton
- The Old Time