- O.T
- Oberaargauer Brass Band
- Oblivion
- OctoSound
- Off the Wall Original Cast
- Officer Woos
- Ogidi Brown
- Ohlala Band
- Ok Joo Hyun
- Oklahoma! - 1998 Royal National Theatre Cast
- Oleg Marshev
- Oleksandr Griegov
- Oli Andres
- Oliver
- Oliver Dragojević
- Oliver Ostermann
- Oliver Wallace
- Oliver! - 1994 London Palladium Cast
- Oliver! - 2009 London Cast
- Oliver! 2009 London Cast
- Olivia Newton-John
- Olivia Rodrigo
- Olivier Auriol
- Olivier Daviaud
- Oliviya Nicole
- Olja'zz Music Factory
- Ollie Jones
- OMJamie
- One Piano
- ONE TAKE BAKE
- One Voice Children's Choir
- OneOrchestra
- Onsmolk
- Onur Güğercinoğlu
- Orchester der Vereinigten Bühnen Wien
- Orchester des Theaters am Kurfürstendamm
- Orchester Filmkunst-Musikverlag
- Orchester Fink & Steinbach
- Orchestra Filarmonica Veneta
- Orchestra of the Age of Enlightenment
- Orchestra of the D'Oyly Carte Opera Company
- Orchestre des Concerts Français
- Orchestre National de Jazz
- Original 1958 London Casts
- Original 1985 London Cast of Gigi
- Original Auckland Festival Cast of Earth and Sky
- Original Australian Cast of Mary Poppins
- Original Berlin Cast
- Original Broadway Cast
- Original Broadway Cast Chorus
- Original Broadway Cast of "Bring It On: The Musical"
- Original Broadway Cast of "Camelot"
- Original Broadway Cast of "Flahooley"
- Original Broadway Cast of "In The Heights"
- Original Broadway Cast of "My Fair Lady"
- Original Broadway Cast of "Tenderloin"
- Original Broadway Cast of "The Unsinkable Molly Brown"
- Original Broadway Cast of "Top Banana"
- Original Broadway Cast of 1776
- Original Broadway Cast Of Aint Too Proud
- Original Broadway Cast of All American
- Original Broadway Cast of Annie
- Original Broadway Cast of Barnum
- Original Broadway Cast of Bravo Giovanni
- Original Broadway Cast Of Can Can
- Original Broadway Cast of Fosse
- Original Broadway Cast of Groundhog Day
- Original Broadway Cast of Hairspray
- Original Broadway Cast of Head Over Heels
- Original Broadway Cast of House of Flowers
- Original Broadway Cast of Irma la Douce
- Original Broadway Cast of Jennie
- Original Broadway Cast of Li'l Abner
- Original Broadway Cast of Miss Liberty
- Original Broadway Cast of Movin' Out
- Original Broadway Cast of Paris '90
- Original Broadway Cast of Peter Pan
- Original Broadway Cast of Spamilton
- Original Broadway Cast of Steel Pier
- Original Broadway Cast of The Rothschilds: A Musical
- Original Broadway Cast of The Sound of Music
- Original Broadway Cast of Thoroughly Modern Millie
- Original Broadway Cast of Turandot
- Original Broadway Cast of Two by Two
- Original Broadway Cast of ‘Rock Of Ages’
- Original Broadway Cast Recording
- Original Cast
- Original Cast & Various Artists
- Original Cast Deutschland
- Original Cast Dresden
- Original Cast Gmunden
- Original Cast Gutenstein
- Original Cast Innsbruck
- Original Cast Landestheater Linz
- Original Cast Leipzig
- Original Cast Linz
- Original Cast of "Cats"
- Original Cast of 1956
- Original Cast of Blanche & Marie
- Original Cast of Brooklyn - The Musical
- Original Cast of Dracula
- Original Cast of EYES
- Original Cast of Frendelaus - Musikalen
- Original Cast of Oðerwais
- Original Cast of PALS - A New Musical
- Original Cast of Pinkalicious
- Original Cast of Rainbow Warrior
- Original Cast Recording
- Original Cast Salzburg
- Original Cast TFN
- Original Cast Vienna
- Original Cast Wien
- Original Casts
- Original deutschsprachiger Cast
- Original Dutch Cast: 42nd Street
- Original German Cast
- Original German Cast of Joseph and the Amazing Technicolor Dreamcoat
- Original Hamburg Cast
- Original German Cast of Joseph and the Amazing Technicolor Dreamcoat
- Original Hamburg Cast
- Original London Cast
- Original London Cast of "Crazy For You"
- Original London Cast of "The Phantom of the Opera"
- Original London Cast of Betty Blue Eyes
- Original London Cast of Blues In the Night
- Original London Cast Of Funny Girl
- Original London Cast Of Matilda – The Musical
- Original London Cast Of Miss Saigon
- Original London Cast of Moby Dick
- Original London Cast of Mrs. Henderson Presents
- Original London Cast Of Paris
- Original London Cast of Salad Days
- Original London Cast of Sister Act
- Original London Cast of Sunny Afternoon
- Original London Cast of The Beggar's Opera
- Original Lovo Loco
- Original Moscow Cast of The Phantom of the Opera
- Original National Youth Music Theatre Cast
- Original National Youth Music Theatre London Cast
- Original New York Cast
- Original Off Broadway Cast
- Original Off Broadway Cast of Christmas In Hell
- Original Off-Broadway Cast of Neurosis
- Original Off-Broadway Cast of Unexpected Joy
- Original Off-Broadway Cast of Whoop Dee Doo!
- Original Off-Broadway Cast of Zombie Prom
- Original Off-Broadway Cast Recording
- Original Prague Cast of Muž se železnou maskou
- Original Revival Cast
- Original Tourcast
- Original West End Cast
- Original West End Cast of Everybody's Talking About Jamie
- Originele Cast
- Orion Moon
- Orioni
- Orlando Pops Orchestra
- Orlov
- Orpheus
- Osca Hao
- Oscar Araujo
- Oscar Hammerstein II
- Oscar Kowalski
- Oscar Peterson
- Oscar Peterson Trio
- Oscar Roig
- Osirys
- OSLU
- OsoThaRapper
- Osvaldo Camahue
- OT_Fresh
- Othello - the Band
- Oui-Oui
- Oukas
- Outcry From Disaster
- Owen Baldwin
- Ozalik-Sondaky