O
- O Little One Sweet (27.6)
- Octave Bliss (26.2)
- Octave Slurs (25.2)
- Octave Slurs G to D (31.1)
- Ode to Joy (26.7)
- Oh How Lovely is the Evening (7.6)
- Oh Say Can You C? (1.2)
- Oh So Smooth (1.3)
- Oiseaux, Si Tous Les Ans, K. 307 (43.7)
- Old Colony Times (18.5)
- Old Ship of Zion (11.6)
- On a Lovely Summer Night (36.4)
- One-Flick Wonder (27.1)
- Our Boys Will Shine Tonight (47.7)
- Over the River and Through the Woods (18.4)