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- O Christmas Tree, O Christmas Tree
- O Come All Ye Faithful
- O Come, Little Children
- O by and by
- O du fröhliche
- O du lieber Augustin
- O Freude über Freude
- O Heiland, reiß die Himmel auf
- O Holy Night
- O laufet, ihr Hirten
- O Little Town Of Bethlehem
- O Rocks Don`t Fall on Me
- O Sanctissima
- O Tannenbaum
- O Tannenbaum du trägst ein’n grünen Zweig
- O, du schöner Westerwald
- O most Holy One
- Ob wir rote, gelbe Kragen
- Oh happy day
- Oh my darling, Clementine
- Oh Shenandoah
- Oh sinner man
- Oh Susanna
- Oh when the Saints
- O wie ist es kalt geworden
- Oh, freedom
- Oh, Mary, don’t you weep
- Oh, My Dear Augustine
- Old Ark’s A-Moverin’
- Old Blue
- Old Chisholm Trail
- Old Folks at home
- Old McDonald had a farm
- Old Smokey
- Old time religion
- On Christmas Night
- On top of old Smoky
- Once In Royal David’s City
- One Bottle of Pop
- One, two, three, four, five
- Ostereier
