Ó Cearbhalláin, Toirdhealbhach O'Brien, Colin O'Brien, Conor J. O'Brien, Richard O'Brien, Tim O'Carolan, Turlough O'Connell, Finneas O'Connell, Ryan O'Connor, Ella Yelich O'Duffy, Grace O'Farrill, Chico O'Gorman, Peter O'Hara, Geoffrey O'Hara, Michael O'Keefe, Laurence O'Laoire, Lillis O'Leary, Jessica (editor) O'Mahoney, Terry O'Mara, Peter O'Neal, Barry O'Neill, Jackie O'Neill, John O'Neill, Paul O'Neill, Susan O'Regan, Tarik O'Reilly, John O'Reilly, Roisin Ann O. Gutman Oakland, Ben Oare, Michael OASIS Oberfeld, Casimir Oberst, Fritz Oberthur, Carl Obijalska, Dorota Obolskaja N. Obradors, Fernando Obrecht, Jacob Obrovska, Jana Ocampo, Mauricio Cardozo Ochs, Siegfried Ockeghem, Johannes Ockelford, Adam Oddo, John Oddone, Edoardo Odeh-Tamimi, Samir Odeh-Tamini, Samir Odell, Tom Oden, Annette Odgren, Jim Odo, Franklin Odone, Alberto Odstrcil, Karel Oehring, Helmut Oerding, Johannes Oermann, Nils Ole Offenbach Jacques Offenbach, Jacques Offer, Charles Offermann, Thomas Ogarkova N. A. Oginski, Michal Kleofas Ogorodnov, V. Ogorodnova, Dina Izrailevna Ogorodnova-Dukhanina, Tamara Ohana, Maurice Oja, Carol J. Okamoto, Shinsuke Okazaki, Miles Okhalova I. - Averjanova O. Okhalova I. - Korzun K. Okoshi, Tiger Okudzhava Bulat Shalvovich Okunev German Olafsdottir, Hallfridur Olah, Tiberiu Olatunji, Babatunde Olazabal, Tirso Oldenkamp, Michiel Oldham, Arthur Oldroyd, George Olechowski, Józef Oler, Kim Olias, Lotar Oliva, John Olivadoti, Joseph Oliveira Pinto, Tiago de Oliver, Joseph King Oliver, Julian Oliver, Nancy Oliver, Sy Olivero, Betty Olivier, François Olivier, Philippe Olivieri Sangiacomo, Elisa Oliviero, N. Olson, Lynn Freeman Olson, Robert Olson, Tawnie Olsson, Milton Olsvay Endre Oltmann, Uwe Olusola, Kevin Omar, Don Omartian, Michael Omelchuk, Oxana Ondrasik, John Ondrícek, František Ondruš, Ján One Direction Ongarello, Antonio Ono, Yoko Onovwerosuoke, Fred Ónozó János Onyeji, Christian Oosterhout, Arjen Oppo, Franco Opurina Tamara Oquin, Wayne Oram, James Oratovskij A. (ed.) Orbán György Orban, Marcel Orbison, Roy Ordasi Péter Ordońez, Carlos d' Orefice, Giacomo Orefici, Alberto Orff, Carl Orff, Gertrud Oriol, Emmanuel Orkisz, Andrzej Orlandi, Paolo Orloff-Tschekorsky, Tatjana Orlov, G. Orlova, Darja Sergeevna Orlowsky, David Orochko Aleksej Orologio, Alessandro Oromszegi Ottó Orr, J. Orr, Robin Orrego-Salas, Juan Orsi, Romeo Országh Tivadar Ort, Jirí Ortelli, Antonio Ortiz, Diego Ortiz, Suzzette Ortiz-Alvarado, Graciela Paraskevaídis William Ortmeier, Philipp Ortolani, Riz Orton, Beth Osborn, Brad Osborne, Anthony Osborne, Nigel Osborne, Reginald Osborne, Richard Osborne, Tony Osbourn, Leslie Osbourne, Ozzy Oscar Peterson Osentowski, Francis Oshrat, Kobi Osin I. (ed.) Oskam, Victor Oskolkov Sergej Aleksandrovich Osmond, Marcella Osorio, Nuno Osovitskaja Z. Ospald, Klaus Osse, Klaus Ostendorf, Jens-Peter Osterling, Eric Ostleitner, Elena Ostransky, Leroy Ostrovskaja Yanina - Frolova Lyudmila Ostrzyga, Michael Oswald, Albert Oswald, Gerald Oswald, Julian Othmayr, Caspar Otros, Y. Ott Rezső Ott, Eugen Ott, Karin Otte, Hans Otten, Mark Otterstedt, Annette Otto, Uwe Ouzounoff, Alexandre Ovadia, Moni Ovcharenko, Halyna Ovchinnikov Vyacheslav Overduin, Jan Overthrow, David Ovokaitys, Cindy Owen Edwards, John Owen, Barbara Owen, Randy Owen, Teodora Owen, William Owenby, Chris Owens, James T. Owens, Jessie Ann Owens, Jimmy Owens, Matthew Owens, Thomas Owsinski, Bobby Oxa, Anna Oxtoby, Charles Ozi, Etienne Ó Cearbhalláin, Toirdhealbhach (autor) O'Connell, Ryan (redactat de) O'Connor-Morris, Geoffrey (prelucrare de) O'Leary, Mark (redactat de) O'Loughlin, Sean (aranjament de) O'Loughlin, Sean (prelucrare de) O'Loughlin, Sean (redactat de) O'Loughlin, Sean (instrumentatie de) O'Neill, Francis (autor) O'Neill, Jackie (prelucrare de) O'Neill, John (autor) O'Neill, Norman (redactat de) O'Neill, Norman (prelucrare de) O'Reilly, John (redactat de) O'Reilly, Kim (interpret) O'Reilly, P.J. (redactat de) OASIS (autor) Oberbek, Jan (editie de) Oberschmidt, Juergen (editie de) Obert, Salome (editie de) Obrecht, Jacob (autor) Obst, Michael (prelucrare de) Obst, Michael (redactat de) Ocean, Johny (instrumentatie de) Ochs, Siegfried (autor) Ocker, Marshall (instrumentatie de) Oddo, John (instrumentatie de) Odermatt, Arnold (redactat de) Odom, Lawrence T. (prelucrare de) Oechsle, Siegfried (redactat de) Oehl, Kurt (editie de) Oehler, Regina (autor) Oehler, Thomas (prelucrare de) Oehrli, Fabian (prelucrare de) Oeser, Fritz (versuri de) Oeser, Fritz (transcriere de) Oeser, Fritz (traducere de) Oeser, Fritz (redactat de) Oesterle, Louis (redactat de) Oetke, Herbert (editie de) Ofburg (instrumentatie de) Ogaard, Sigurd (prelucrare de) Ogonovsky, Margaret (aranjament de) Ohanian, David (aranjament de) Ohmen, Wilhelm (redactat de) Ohmen, Wilhelm (editie de) Ohmen, Wilhelm (prelucrare de) Ohmiya, Makoto (redactat de) Okuljar, Tadeusz (editie de) Oldenkamp, Michiel (redactat de) Oldman, Cecil B. (redactat de) Oleskiewicz, Mary (redactat de) Oliva, Petr (redactat de) Oliver, David (editie de) Ollivo, Yann (reductie pentru pian de) Olson, Kevin (redactat de) Olson, Lynn Freeman (editie de) Olson, Lynn Freeman (aranjament de) Olson, Robert (redactat de) Oltman, Matthew (redactat de) Ondra Hirokawa, Joy (redactat de) Ondra, Jaroslav (aranjament de) Ondrícek, František (transcriere de) One Republic (interpret) Ongarello, Antonio (editie de) Ongarello, Antonio (aranjament de) Ónozó János (editie de) Opp, Walter (redactat de) Oppermann, Annette (redactat de) Oppermann, Annette (editie de) Orbán György (transcriere de) Orbán György (redactat de) Orbán György (reductie pentru pian de) Orbán György (colaborare la compozitie) Orbán György (editie de) Orbán György (prelucrare de) Orbán Ottó (traducere de) Orel, Alfred (redactat de) Orel, Alfred (versuri de) Orelli, Matthias von (editie de) Orem, Philip (redactat de) Orenstein, Arbie (redactat de) Orff, Carl (autor) Orff, Gertrud (editie de) Orford, John (editie de) Orga, Ates (redactat de) Orledge, Robert (prelucrare de) Orledge, Robert (editie de) Ormandy, Eugene (prelucrare de) Ormay Imre (versuri de) Ormay Imre (traducere de) Oromszegi Ottó (editie de) Orphee, Matanya (redactat de) Országh Tivadar (alcătuit de) Országh Tivadar (transcriere de) Országh Tivadar (transcriere pentru vioară si pian) Ortega, J. (redactat de) Ortega, J. (transcriere si editie de) Ortelt, Sabine (autor) Ortiz, Juan (instrumentatie de) Ortiz, Juan (redactat de) Ortkemper, Hubert (editie de) Ortner, Franz (editie de) Osborne, Tony (redactat de) Osborne, Tony (editie de) Oslansky, Stefan (autor) Ostendorf, Jens-Peter (redactat de) Osterling, Eric (instrumentatie de) Osterling, Eric (redactat de) Osthoff, Helmuth (redactat de) Osthoff, Wolfgang (editie de) Osthoff, Wolfgang (redactat de) Osvát Erzsébet (versuri de) Oswald, Gerald (instrumentatie de) Oswald, Julian (autor) Ötsch, Barbara (redactat de) Ott Rezső (reductie pentru pian de) Ott, Immanuel (editie de) Ott, Thomas (editie de) Ottensamer, Andreas (prelucrare de) Ottenschläger, Elke (autor) Otterstedt, Annette (redactat de) Oud, Thijs (aranjament de) Oud, Thijs (instrumentatie de) Outram, Martin (prelucrare de) Over, Bertold (redactat de) Overton, David (redactat de) Owen, Don (instrumentatie de) Owen, Teodora (autor) Ozawa, Kazuko (editie de) Ozawa, Kazuko (redactat de) Ozim, Igor (editie de) Ozsvárt Viktória (redactat de)