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Publishers – O
- O.Ruby Productions
- O'Brien Press
- Oak Archives
- Oak Publications
- Obrasso Verlag
- Ocarina Workshop
- Octava Music
- Oertel
- Oktavian Music
- Old Time Music and Dance
- Oldenkamp-Kastelein Publications
- Olympia Music Publishing
- Omnibus Press
- Only1million
- Onyx Brass
- Onze Music
- Opus 10
- Opwekking lectuur
- OR-TAV Music Publications
- Oriana Music
- Orpheus Music
- Ossian Publications
- Osti Music
- Otago Press
- Otago University Press
- OTON Musikverlag
- Otto Junne Musikverlag
- Otto Wrede Regina-Verlag
- OUP Archive
- Outlook Verlag
- Overscore
- Oxford University Press
