- Roy Orbison & The Teen Kings
- Thoroughly Modern Millie Orchestra & Michael Rafter
- William McDowell & Martha Munizzi
- Oscar the Grouch
- Vic Damone
- Mudhoney
- Michael Crawford
- Psymbionic & Of The Trees
- Rashidra Scott, Ashley Blanchet, Alysha Deslorieux, Carly Hughes & Jessie Mueller
- Method Man, Ghostface Killah & Raekwon
- The Orion Experience
- Jerome McComb
- Orchestra, Sisqó & Dru Hill
- Stefan Schilli, Bela Nagy & Budapest Failoni Chamber Orchestra
- Oxford Schola Cantorum & Jeremy Summerly
- Saga
- Stephen Speaks
- Golf Boys
- The Pride of Oklahoma Marching Band
- Jane Lynch
- Origa
- John Michael King, Franz Allers & My Fair Lady Orchestra
- The Hunchback of Notre Dame Ensemble (Studio Cast Recording) & The Hunchback of Notre Dame Choir (Studio Cast Recording)
- Sea Wolf
- Trombone Shorty & James Andrews
- TWICE
- John Butler
- Scott Bomar
- Geddy Lee & Alex Lifeson
- Irwin Kostal, Evadne Baker, Anna Lee, Portia Nelson & Marni Nixon
- John Williams, Ronit Shapira, Giora Feidman & The Li-Ron Herzeliya Children's Choir
- Renee Olstead & Carol Welsman
- Otis Rush
- School of Seven Bells
- MGM Studio Orchestra, The Debutantes & The Rhythmettes
- Mathai
- The Subways
- Michael Joncas
- Robert Shaw & Robert Shaw Chamber Singers
- Michelle Chamuel & Usher
- Shades of Blue
- Oiki
- South Pacific Orchestra (2008) & Ted Sperling
- OutFit Studios
- Orquesta Guayacán
- Olivia
- Old Southern Moonshine Revival
- The Romantics
- Original Cast Recording
- Shark Tank
- The Drifters
- DJ Jazz II
- Sweet Sable
- Ólafur Arnalds & Arnor Dan
- The Cross Movement
- Ronnie McDowell
- Trixter
- Mariah Carey & Boyz II Men
- Mindy Smith
- Queen Of The Damned Soundtrack
- US Air Force Band
- Stan Getz & João Gilberto Quintet
- The Marketts
- Smokey Robinson & Ledisi
- Jimmy Nail
- Mel Brooks, Original Motion Picture Soundtrack, Bryn Dowling, Meg Gillentine, Ensemble & Orchestra
- Someone's Little Sister
- The Bamboos
- Oliver Wallace, Paul J. Smith & Verna Felton
- Mel Brooks, Original Motion Picture Soundtrack & Orchestra
- Mick Hucknall
- P-LO
- The Go-Go's
- Ray J & Pitbull
- Oakenfold
- The Cliks
- Outernational
- Tia Mowry
- Original Broadway Cast of Finding Neverland
- Olympia Brass Band
- Oranger
- Irwin Kostal, Anna Lee, Portia Nelson, Marni Nixon & Evadne Baker
- Orpheus Chamber Orchestra
- Olivia Olson
- Tiffany Affair
- Oversea
- Steven Pasquale & Kelli O'Hara
- TJ McCloud
- Ondrej Lenárd & Slovak Radio Symphony Orchestra
- Pete Murray
- Wizkid
- The Beatnuts & Cuban Linx
- Tea Leaf Green
- Pascal M & Ron Hagen
- Jonathan Pryce
- Ohio Express
- Rufus Wainwright & Kate McGarrigle
- Saint Etienne
- University of Wisconsin Marching Band
- Jennifer Holliday, Sheryl Lee Ralph, Loretta Devine, Deborah Burrell & The Company