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| name | . lyrics . | . midi . | file name | artist |
| Ocean deep | Y | X | 8154 | Cliff Richard |
| Oh! Carol | Y | X | 213 | Pual Anka |
| Oh! my love | Y | X | 214 | John Lennon |
| One clear voice | Y | X | 8393 | Peter Cetera |
| One moment in time | Y | X | 8297 | Whitney Houston |
| One way ticket | Y | X | 8022 | Neil Sedaka |
| Only sixteen | Y | X | 8115 | Dr. HOOK |
| Only yesterday | Y | X | 8101 | Carpenters |
| Only you | Y | X | 8146 | The Platters |
| Over the rainbow | Y | X | 8052 | E.Y. Harburg/Harnold Arlen |
| O-bla-di, O-bla-da | X | Y | 252 | The Beatle |