| Artist | Titel | Tracks | Länge |
|
| Oratorio della SS.Vergine - Ezechia... | Oratorio della SS.Vergine - Ezechias | 11 | 46:19 |
| Olivier Messiaen | Organ Works, La Nativite du Seigneur, Le Banquet Celest... | 10 | 1:1:57 |
| Oskar Gottlieb Blarr, Peter Rübsam | Orgel und Dudelsack | 11 | 48:58 |
| Organist Georg Schaeffner | Orgelkonzert Basilika Gössweinstein | 14 | 1:12:5 |
| Organist Ludwig Doerr | Orgelmusik aus dem Freiburger Muenster | 13 | 1:8:27 |
| Orgelmusik aus St. Nikolai zu Stral... | Orgelmusik aus St. Nikolai zu Stralsund | 17 | 1:10:9 |
| Orgel: Paul Beszynski, Schola: Bern... | Orgelmusik und Choralgesang; St. Vicentius, Dinslaken | 17 | 1:5:28 |
| Orgelwerke - Felix Mendelssohn Bart... | Orgelwerke - Felix Mendelssohn Bartholdy | 20 | 1:14:8 |
| Organ in Heidelberg | Orgelwerke - J.-G. Rheinberger - M. E. Bossi | 8 | 57:22 |
| Organister på Karmøy | Orglene i Karmøy | 14 | 1:13:33 |
| Orgue et Hautbois à l'Abbaye Saint... | Orgue et Hautbois à l'Abbaye Saint-Wandrille | 20 | 52:55 |
| Orgue et Violoncelle à l'Abbaye Sa... | Orgue et Violoncelle à l'Abbaye Saint-Wandrille | 20 | 1:3:13 |
| Oriana | Oriana | 23 | 44:54 |
| | | |
| Original Prague Syncopated Orchestr... | Original Prague Syncopated Orchestra - Bel Ami | 15 | 41:48 |
| Orlando di Lasso Ensemble | Orlando di Lasso -Viersprachendruck | 28 | 58:3 |
| Orlando di Lasso Ensemble Hannover;... | Orlando di Lasso, Mariengesänge und Hohelie | 22 | 1:1:51 |
| Olivier Vernet | Organ dances | 14 | 58:51 |
| OAE/Asperen | Organ Concertos OP.7(Disc2)/ G.F.Handel | 25 | 1:17:1 |
| Orchestra Sinfonica E Coro Della Ra... | Oratorio Di Natale - Johann Sebastian Bach | 17 | 1:15:54 |
| Orchester der Deutschen Kinderärzt... | Orchester der Deutschen Kinderärzte 1992 | 7 | 1:14:52 |
| Orchester der Deutschen Kinderärzt... | Orchester der Deutschen Kinderärzte 1999 | 8 | 1:4:15 |
| Orchester Fred Rabold | Orchester Fred Rabold - 70th anniversary | 15 | 44:29 |
| orchestra villa lobos | orchestra villa lobos | 11 | 47:2 |
| Orchestra: Saint Paul's Philiharmon... | Orchestra: Saint Paul's Philiharmonic Orchestra | 7 | 1:1:55 |
| Orchestre Des Jeunes Del La Mediter... | Orchestre Des Jeunes Del La Mediterranee | 6 | 58:35 |
| Orchestre (Various) | Orchestre Symphonique de Montréal (Saison 04-05) | 9 | 59:12 |
| Orchestre Symphonique de RTL | Orchestre symphonique de RTL 60 ans 1933-1993 | 10 | 1:15:46 |
| Ole Schmidt/Gunnar Jansson; Niels W... | Oresundsymfonin; Violin Concerto | 7 | 1:6 |
| Orfeón Donostiarra - Euskal kantak | Orfeón Donostiarra - Euskal kantak | 19 | 52:59 |
| Orfeon Oda Korosu | Orfeon Chamber Choir / 10 | 20 | 1:1:32 |
| Ormandy Philadelphia Orchestra | Orff.Carmina Burana | 26 | 58:58 |
| Orff | Orff; Antigonae CD2 | 9 | 55:35 |
| Orff | Orff; Antigone CD1 | 11 | 52:52 |
| Orford String Quartet | Orford String Quartet -Various | 9 | 1:14:16 |
| Oxford Camerata - Jeremy Summerly | Orlando Gibbons: Choral and Organ Music | 16 | 1:5:21 |
| Offenbach | Orphée aux enfers | 14 | 43:52 |
| OS ANIMAIS | OS ANIMAIS | 14 | 28:43 |
| Orqestra Filarmónica De Londres | Os Grandes Clássicos - Wolfgang Amadeus Mozart | 10 | 59:9 |
| Os cavaleiros do novo milenio | Os mais belos cantos gregorianos n 1 | 20 | 1:3:58 |
| Os Mais Belos Clássicos | Os Mais Belos Clássicos | 7 | 48:32 |
| Oscar Esplá | Oscar Esplá (Disc 1) | 11 | 1:11:38 |
| Oskar Birchmeier, Hans Zumstein | Oskar Birchmeier und Hans Zumstein an den Orgeln der eh... | 11 | 1:2:54 |
| Oskar Merikanto | Oskar Merikannon kauneimmat | 20 | 56:29 |
| Ossy Renardy | Ossy Renardy: the Victor recordings (1940-1941), CD 2 | 9 | 37:6 |
| Ossy Renardy | Ossy Renardy: the Victor recordings (1940-1941), CD I | 24 | 45:36 |
| Oberlaaer Kirchenchor | Osterhochamt 2001 in Oberlaa | 17 | 50:18 |
| Ostinato | Ostinato in concert | 15 | 49:15 |
| Ostravske Trio | Ostravske Trio | 9 | 48:52 |
| Oberdörfer Dietrich | Otem | 11 | 45:10 |
| | | |
| Othmar Schoeck | Othmar Schoeck - Das Stille Leuchten | 28 | 51:31 |
| ORF-Symphonieorchester - Gerd Albre... | Othmar Schoeck: Penthesilea | 17 | 1:20 |
| Ortigueira con la música | Ortigueira con la música | 20 | 1:5:22 |
| Orlin Anastassov, Seven Saints Choi... | Orthodox Chants | 11 | 48:53 |
| Orpheus Chamber Orchestra | Orpheus Discovered | 11 | 54:1 |
| Orquesta Cámara Esc Sup Mús R Sof... | Orquesta De Cámara Freixenet | 10 | 54:52 |
| Orquesta de Cámara Reina Sofía | Orquesta de Cámara Reina Sofía | 11 | 1:6:53 |
| Orquesta Filarmomica de Israel | Orquesta Filarmonica de Israel | 7 | 1:11:23 |
| Orquesta Sinfónica de la Universid... | Orquesta Sinfónica de la Universidad Nacional de San J... | 9 | 56:37 |
| ORQUESTA SINFÓNICA Y CORO DE RTVE | Orquesta Sinfónica y Coro de RTVE | 12 | 41:46 |
| Orquesta Sinfónica y Coro de RTVE ... | Orquesta Sinfónica y Coro de RTVE - Jacinto Guerrero | 16 | 1:5:21 |
| Orquesta Sinfônica do Estado de SP... | Orquesta Sinfônica do Estado de SP, Luciana Souza e Ba... | 8 | 56:42 |
| Orquestra de camara xove e grupo vo... | Orquestra de camara xove e grupo vocal "solo voces" | 11 | 54:6 |
| Orquestra de Câmara Sesi Fundarte | Orquestra de Câmara Sesi Fundarte | 16 | 1:8:51 |
| Orquestra de Guitarras | Orquestra de Guitarras | 9 | 1:15:58 |
| Orquestra Ligeira do Clube Cultural... | Orquestra Ligeira C.C.D.V. - 1994 | 10 | 37:58 |
| Orquestra Tabajara | Orquestra Tabajara CD 1 | 14 | 51:33 |
| Orquestra Tabajara | Orquestra Tabajara CD 2 | 14 | 50:17 |
| Orquestra Tabajara | Orquestra Tabajara CD 3 | 14 | 54:9 |
| Orquestra Tabajara | Orquestra Tabajara CD 4 | 14 | 51:41 |
| Otis Redding | Otis! The Definitive Otis Redding CD 1 | 24 | 1:6:29 |
| Offenbach | Offenbach - La fille du tambour major (2) | 10 | 44:38 |
| Ole Edvard Antonsen | Ole Edvard Antonsen, Trumpet | 14 | 47:30 |
| Oleg Kagan | Oleg Kagan - EDITION VOL. XV | 7 | 1:11:45 |
| Oleg Kagan | Oleg Kagan Edition VOL.XXVII | 7 | 1:13:3 |
| Oleg Kagan (violin), Natalia Gutman... | Oleg Kagan Edition, Vol XII | 8 | 50 |
| Oleg Volkov | Oleg Volkov & Moscow Philharmonic Orchestra | 6 | 1:3615 |
| Olga Neuwirth | Olga Neuwirth | 5 | 53:25 |
| Olga Marie Mikalsen | Olga synger solo | 14 | 54:50 |
| Oliver Messiaen | Oliver Messiaen | 8 | 43:16 |
| Olivier Messiaen | Olivier Messiaen / Oeuvres pour orgue - Disk 1 | 7 | 1:3658 |
| Olivier Messiaen | Olivier Messiaen / Oeuvres pour orgue - Disk 2: La Nati... | 9 | 1:3625 |
| Olivier Messiaen | Olivier Messiaen / Oeuvres pour orgue - Disk 3: Les Cor... | 7 | 52:25 |
| Olivier Messiaen | Olivier Messiaen / Oeuvres pour orgue - Disk 4 | 12 | 1:13:51 |
| Olivier Latry | Olivier Messiaen Complete Organ Works D6 | 12 | 1:11:40 |
| Olivier Messiaen | Olivier Messiaen interviewed by Claude Samuel | 1 | 58:18 |
| Olivier Latry | Olivier Messiaen, Complete Organ Works (CD1) | 10 | 1:12:45 |
| Olivier Latry | Olivier Messiaen, Complete Organ Works (CD2) | 10 | 1:18:36 |
| Old Love Songs | Old Love Songs | 14 | 1:3:34 |
| Oklahoma State Wind Ensemble 1997 | Oklahoma State Wind Ensemble 1997 | 8 | 53:40 |
| Offenbach, Jacques | offenbach - Les Contes d'Hoffman - Bovy, Paris Op Comiq... | 20 | 1:12:26 |
| Ofra Harnoy, cello; Cincinnati Orch... | Offenbach's World: Gaite Parisienne; La Belle Helene; B... | 16 | 1:17:12 |
| Offenbach, Jacques - Gaite Parisien... | Offenbach, Jacques - Gaite Parisienne - Pittsburgh Symp... | 22 | 41:5 |
| Offenbach, Jacques - Overtures - Ph... | Offenbach, Jacques - Overtures - Philharmonia Orchestra... | 8 | 43:49 |
| Offenbach | Offenbach, Les Conties D'Hoffmann, Cluytens, Gedda, de ... | 26 | 1:16:29 |
| Offenbach | Offenbach, Les Conties D'Hoffmann, Cluytens, Gedda, de ... | 23 | 1:15:48 |
| Office CD 2 | Office CD 2 | 14 | 1:7:4 |
| ohana | Office des Oracles - Messe | 23 | 1:11:13 |
| Ofra Harnoy | Ofra Harnoy & friends | 11 | 50:59 |
