Composer whose last names start with "O":
- O'boyle, Sean (276)
- O'brien, Francis Patrick (129)
- O'Brien, Michael (6)
- O'brien, Richard (85)
- O'Brien, Tim (3)
- O'carolan, Turlough (69)
- O'Connell, Ryan (3)
- O'connor, Mark (1)
- O'Connor, Sinead (2)
- O'day, Anita (1)
- O'Donnell, Marty (2)
- O'Farrill, Chico (6)
- O'Gorman, Peter (7)
- O'Hara, Geoffrey (18)
- O'hara, Jamie (10)
- O'Hearn, Arletta (19)
- O'hern, Michael (29)
- O'Kaine, Rachel Steckler (8)
- O'Leary (1)
- O'Loughlin, Sean (549)
- O'Mara, Peter (5)
- O'Neal, Jamie (3)
- O'Neill, Jackie (6)
- O'Neill, John (78)
- O'neill, Paul (1)
- O'Regan, Tarik (87)
- O'Reilly, John (571)
- O'reilly, Sally (12)
- O'sullivan, Donal (1)
- O'Sullivan, Gilbert (15)
- O.A.R. (Of a Revolution), (1)
- Oakeley, Herbert (1)
- Oakes, David (2)
- Oakes, Rodney (8)
- Oakland, Ben (26)
- Oare, Michael (497)
- Oasis (4)
- Oates, John (18)
- Oberdoerffer, Fritz (1)
- Oberleitner, Andreas (1)
- Oberst, Fritz (1)
- Oberthur, Karl (4)
- Obiols, Angel (6)
- Obispo, Pascal (8)
- Obrecht, Jacob (10)
- Obrovska, Jana (2)
- Obst, Michael (1)
- Ocean, Billy (14)
- Ocean, Frank (15)
- Ochs, Bill (1)
- Ochs, Klaus (23)
- Ochs, Siegfried (5)
- Ockeghem, Johannes (19)
- Oden, Annette (29)
- Odgren, Jim (4)
- Oehring, Helmut (1)
- Oertzen, Rudolf Von (16)
- Of Monsters and Men, (6)
- Offenbach, Jacques (778)
- Offspring, The (16)
- Ogawa, Takashi (81)
- Ogden, Nigel (17)
- Ohana, Maurice (65)
- Ohio Players, The (1)
- Ohmae, Satoshi (6)
- Ohrwall, Anders (83)
- Ohse, Reinhard (6)
- Okumura, Hajime (1)
- Okun, Milton (1)
- Olatunji, Babatunde (1)
- Olcott, Chauncey (30)
- Olcott, James (14)
- Old Crow Medicine Show, (1)
- Oldfield, Mike (5)
- Oldham, Kevin (10)
- Oldroyd, George (2)
- Oler, Kim (14)
- Oley, Johann Christoph (7)
- Oliva, Jon (1)
- Olivadoti, Joseph (3)
- Olive, Vivienne (72)
- Oliveira, Jamary (1)
- Oliver, Curt (26)
- Oliver, Nancy (2)
- Oliver, Stephen (5)
- Oliver, Sy (23)
- Olivero, Betty (5)
- Olpen, Friedrich W. (102)
- Olsen, Alice (4)
- Olsen, Ole (5)
- Olsen, P. (2)
- Olson, Kevin (106)
- Olson, Lynn Freeman (166)
- Olsson, Hakan (1)
- Olsson, Otto (57)
- Oltra, Manuel (27)
- Omartian, Michael (50)
- Ona, Erik (1)
- Ondrasik, John (62)
- One Direction, (52)
- OneRepublic (6)
- Onna, Peter van (2)
- Ono, Yoko (45)
- Onorati, Henry (39)
- Onslow, George (23)
- Opeth (1)
- Ophee, Matanya (1)
- Ophoven, Hermann (102)
- Oppel, Hans (7)
- Oppenheim, Tony (1)
- Opperman, Kalmen (13)
- Orban, Gyorgy (46)
- Orbison, Roy (105)
- Orbon, Julian (6)
- Orchestra, The (1)
- Orcino, Len (48)
- Ore, Cecilie (2)
- Orff, Carl (261)
- Orff-Willert, Gertrud (2)
- Orgad, Ben-Zion (5)
- Organ, Anne Krentz (37)
- Orland, Henry (11)
- Ornadel, Cyril (2)
- Ornstein, Leo (8)
- Orologio, Alessandro (10)
- Orozco, Felipe (5)
- Orr, Bud (4)
- Orr, Buxton (1)
- Orrall, Robert Ellis (12)
- Orrego-Salas, Juan (105)
- Orrel, Max (81)
- Ortega, Fernando (2)
- Ortega, Miquel (9)
- Orthel, Leon (5)
- Ortiz, Diego (34)
- Ortolani, Riz (5)
- Orton, Beth (2)
- Osborn, Kristyn (9)
- Osborne (8)
- Osborne, Charles (10)
- Osborne, Chester G. (1)
- Osborne, Jeffrey (7)
- Osborne, Sonny (2)
- Osborne, Willson (4)
- Osbourne, Ozzy (165)
- Oscheit, Max (1)
- Osgood, Charles (3)
- Osieck, Hans (1)
- Oslin, K.T. (1)
- Osmon, Leroy (139)
- Osmond, Donny (6)
- Ospald, Klaus (3)
- Osse, Klaus (1)
- Ostendorf, Jens-Peter (2)
- Osterling, Eric (124)
- Ostling, Acton E. (17)
- Oswald, Henrique (1)
- Otero, Francisco (1)
- Othegraven, August von (12)
- Othmayr, Caspar (22)
- Otis, Clyde (14)
- Ott, David (36)
- Otte (3)
- Otten, Ludwig (7)
- Otterstedt, Annette (1)
- Ottner, Carmen (5)
- Otto, James (5)
- Our Lady Peace (3)
- Ourkouzounov, Atanas (115)
- Ovanin, Nikola (10)
- Overstreet, Paul (43)
- Overthrow, David (15)
- Overton, Hall (2)
- Owen, Chuck (29)
- Owen, Jake (7)
- Owen, Steve (18)
- Owen, William (6)
- Owens (20)
- Owens, Buck (18)
- Owens, Ginny (5)
- Owens, Jimmy (8)
- Owens, Rebecca Kleintop (3)
- Owens, Sam Batt (59)
- Owens, Terry (5)
- Owens, William (241)
- Owl City, (2)
- Owolabi, Kola (1)
- Oxley, Harrison (7)
- Oyens, Tera de Marez (10)
- Ozi, Etienne (14)
- Ozim, Igor (1)