| The Oath (1) | The Oberlin Baroque Ensemble (1) | The Oberlin Trio (1) |
| The Object (3) | The Oblivians (1) | The Oblivion (1) |
| The Oblivion Seekers (2) | The Oblivious (1) | The Obscure (1) |
| The Obscure Project (1) | The Observatory (1) | The Observers (2) |
| The Obsessed (9) | The Obtruders (1) | The Obvious (3) |
| The Obvious Wish (1) | The Occasion (3) | The Occasionals (2) |
| The Occult Morphinas (1) | The Ocean (3) | The Ocean As Mistress (1) |
| The Ocean Band (1) | The Ocean Blue (8) | The Ocean Collective (1) |
| The Ocean Fracture (1) | The Oceon (1) | The Octabites (1) |
| The Octagon Man (2) | The Octaves (3) | The October Circle (1) |
| The October Country (1) | The October Flatline (1) | The October Game (1) |
| The Octopus Project (1) | The Octopus Project + Black Moth Super Rainbow (1) | The Odd (1) |
| The Odd Company - (1) | The Odd Hack Band (1) | The Odd Numbers (4) |
| The Odd Persons (1) | The Odd Toot (1) | The Oddfellows (1) |
| The Odds (2) | The Oddsmakers (1) | The Oddz (1) |
| The Odorants (1) | The Odyssey Blues Band featuring Suzanne Hyatt (1) | The Oedipus (1) |
| The Offbeatniks (1) | The Offbeats (1) | The Offcutts (1) |
| The Offenders (1) | The Offical No.1 (1) | The Officer&Elios (1) |
| The Official 70's Funk Soundtrack from Vigilante 8 (1) | The Official ATHENS 2004 Olympic Games Classical Album (1) | The Official Athens 2004 Olympic Games Album (1) |
| The Official Compilation 2002 cd02 (1) | The Official Top Electronic (2) | The Offramps (1) |
| The Offs (1) | The Offsping (1) | The Offspring (316) |
| The Offspring + Agnostic Front (1) | The Offsprings (2) | The Offsring (1) |
| The Ogden Edsl (1) | The Ohio Express (1) | The Ohio Players (2) |
| The Ohio State University Marching Band (6) | The Ohio State University Men's Glee Club (1) | The Ohio Valley British Brass Band (1) |
| The Ohms (1) | The Oikoleros (1) | The Ointment Project (1) |
| The Ojay's (1) | The Ojays (1) | The Ojays & The Isley Brothers (1) |
| The Oketeke Choir (2) | The Okros Ensemble (1) | The Oktober People (1) |
| The Olarn Project (3) | The Old Ceremony (1) | The Old Country Store (1) |
| The Old Dead Tree (3) | The Old Farmer's Almanac (1) | The Old Fashioned Love Band (1) |
| The Old Fashioned Revival Hour Quartet (1) | The Old Fashioners (1) | The Old Firm (2) |
| The Old Gray Goose (1) | The Old Hat Dance Band (1) | The Old Haunts (2) |
| The Old Hollow Stringband (1) | The Old Jazz Men (1) | The Old Joe Clarks (2) |
| The Old Kings (1) | The Old Man & The Sea (3) | The Old Man and the Sea (1) |
| The Old Rhine Swingband (1) | The Old Skool Reunion (1) | The Old Sod Band (1) |
| The Old Soul (1) | The Old South Brass Organ & Timpani (1) | The Old Spice Boys (1) |
| The Old Swan Band (1) | The Old Sweethearts (1) | The Old Testament (14) |
| The Old Time Radio Gang (1) | The Old Triangle (1) | The Old Valley Restoration Society (1) |
| The Old World (1) | The Old school Bluegrass Band (1) | The Oldham Tinkers (4) |
| The Olga Symphony (2) | The Olive (1) | The Oliver Brown Trio (2) |
| The Oliver Lake Quartet (1) | The Oliver St. John Gogarty (1) | The Oliver St. John Gogarty Bar (1) |
| The Oliver Twist (1) | The Olivia Tremor Control (4) | The Olivia Tremor Control vs Black Swan Network (1) |
| The Olsen Girls (1) | The Olympic Bouzouki Group (1) | The Olympic Orchestra (1) |
| The Olympic Sideburns (1) | The Olympics (3) | The Omega Syndicate (6) |
| The Omnia (1) | The Once Over Twice (2) | The Ondekoza (6) |
| The One (2) | The One & Only OST (1) | The One (渦 錳) (1) |
| The One AM Radio (2) | The One Am Radio (1) | The One And Only (1) |
| The One Doctor (1) | The One Ensemble of Daniel Padden (1) | The One Inch Punch (1) |
| The One Seventeens (1) | The One Up Downstairs (1) | The One World Drummers (1) |
| The One You Love (1) | The One, The Only, Sandy (1) | The One-t odc (1) |
| The One/Peter Perrett (1) | The One: Promo Record (1) | The OneUps (1) |
| The Ones (13) | The Ongaku Masters (4) | The Onion (2) |
| The Only Blip Hop Record You Will Ever Need, Vol. 1 (1) | The Only Children (1) | The Only Four Chillers (1) |
| The Only Ones (12) | The Only Solution (2) | The Onlys (1) |
| The Onvipe Band (1) | The Onyas (3) | The Oohlas (1) |
| The Oohs (3) | The Oom Maw Maw (1) | The Open (6) |
| The Open Mind (2) | The Opera Band (1) | The Opera Collection (4) |
| The Opera Company (1) | The Opera To Relax (OTR) (1) | The Operative (2) |
| The Operators (2) | The Operators 780 (2) | The Ophelia's Garden (1) |
| The Ophelias (1) | The Ophelia´s Dream (1) | The Oppenheimer Project (1) |
| The Opposite Sax (1) | The Opposites (1) | The Opposition (2) |
| The Oppresse (1) | The Oppressed (11) | The Optic Nerve (1) |
| The Optimen (1) | The Optionals (1) | The Opus (3) |
| The Oracle (1) | The Orakle (1) | The Orange (1) |
| The Orange Band (1) | The Orange County Daredevils (1) | The Orange County Supertones (1) |
| The Orange Dixielanders (1) | The Orange Humble Band (1) | The Orange Man Theory (1) |
| The Orange Peels (2) | The Orange Show (1) | The Orange Sky (1) |
| The Oranges (1) | The Oranges Band (6) | The Oratoria Society of Utah and Nachtmusic Orchestra (1) |
| The Oratorio Singers (1) | The Orb (106) | The Orb V Meat Beat Manifesto (1) |
| The Orb v Meat Beat Manifesto (1) | The Orb vs. Pink Floyd (1) | The Orchestra (4) |
| The Orchestra Laterna Magica (1) | The Orchestra Of St. John's, Smith Square (1) | The Orchestra Of The Royal Opera House Covent Garden Carlo Rizzi (1) |
| The Orchestra of Lithuanian Armed Force (1) | The Orchestra of St. John's Smith Square, London (1) | The Orchestra of Vienna Volksoper (1) |
| The Orchestra of the Eighteenth Century (1) | The Orchestra of the Royal Opera House (2) | The Orchestra of the Royal Opera House Covent Garden (cond. Mark Ermler) (2) |
| The Orchestra of the Royal Opera House, Covent Garden (4) | The Orchestra plays Lars Møller and Jesper Riis (1) | The Orchestra plays music by Niels Gerhard (1) |
| The Orchestra-NaSA (1) | The Orchestre Murphy (1) | The Orchid (1) |
| The Orchid Highway (1) | The Orchids (5) | The Ordeal (2) |
| The Order (1) | The Order That Shall Be (1) | The Ordinaires (2) |
| The Ordinary Boys (12) | The Ordinary Boys Vs Lady Sovereign (1) | The Ordinary Way (1) |
| The Oregon Symphony (1) | The Oregon Symphony Horns and Friends (1) | The Oregon Symphony, James De Preist (1) |
| The Oregon Symphony, James DePreist, Conductor (1) | The Orford String Quartet (3) | The Organ (3) |
| The Organ Lady (1) | The Organ Trio (3) | The Organ of Hofkirche Lucerne Organist Karl Raas (1) |
| The Organ of Westminster Cathedral, David Hill, Organist (1) | The Organic Sound Orchestra (1) | The Organiser (1) |
| The Organization (2) | The Organizers (1) | The Organizers +1 (1) |
| The Orginal Brothers and Sisters of Love (1) | The Orginal Shot (1) | The Orginal Soundtrack From The Motion Picture (1) |
| The Orgone Box (2) | The Orgones (1) | The Oriental Jive Star (1) |
| The Origin (4) | The Origin Of The Sound (1) | The Original (5) |
| The Original 5 Blind Boys of Mississippi (1) | The Original Acoustic Hot Tuna (Jorma & Jack) (2) | The Original Animals (1) |
| The Original Australian Cast (1) | The Original Blind Boys of Alabama (1) | The Original Blues Project (1) |
| The Original Broadway Cast (2) | The Original Brothers and Sisters of Love (1) | The Original Camellia Jazz Band (1) |
| The Original Carter Family (1) | The Original Cast (1) | The Original Cast Recording (2) |
| The Original Chuck Wagon Gang (1) | The Original Contemporaries (2) | The Original Danash Polcalypso Orchestra (1) |
| The Original Danish Polcalypso Orchestra (1) | The Original Dixieland Jazz Band (6) | The Original Dome Series (2) |
| The Original Don Cossacks of Russia (1) | The Original Drifters (Featuring Bill Pinkney) (1) | The Original Dubliners (2) |
| The Original Elvie Presley Collection [12 CD] (1) | The Original Elvis Presley Collection [50 CD-Box] (9) | The Original Five Blind Boys Of Alabama (1) |
| The Original Five Blind Boys Of Mississippi (1) | The Original Five Blind Boys of Alabama (4) | The Original Five Blind Boys of Mississippi (1) |
| The Original Fleedwood Mac Blues Band (1) | The Original Grin (1) | The Original Groups (1) |
| The Original Harmony Ridge Creek Dippers (3) | The Original Hit Collection (1) | The Original Hit Performances (1) |
| The Original Hot Tuna w/ Barry Mitterhoff (1) | The Original Houghton Weavers (3) | The Original Ibiza Resident Djs (1) |
| The Original Indonesian Krontjong Serenaders (1) | The Original Instrument (1) | The Original Jazzy Jay (1) |
| The Original Klezmer Jazz Band (1) | The Original Landon Cast (1) | The Original Latin All Stars (2) |
| The Original Local Blues Brothers (1) | The Original London Cast (2) | The Original London Cast Recording (1) |