Index - O
| Octavation | Music.LilyPond.Light.Model, Music.LilyPond.Light |
| octpc_to_note | Music.LilyPond.Light.Notation, Music.LilyPond.Light |
| Open | Music.LilyPond.Light.Model, Music.LilyPond.Light |
| opus | Music.LilyPond.Light.Model, Music.LilyPond.Light |
| outer_margin | Music.LilyPond.Light.Model, Music.LilyPond.Light |