TJ O'Neill Songs: A Pirate Looks at 40 (& Stick Figure, KBong & Johnny Cosmic)
O.A.R.
Also known as "Of a Revolution"
Songs: That Was a Crazy Game of Poker - Shattered (Turn The Car Around) - Peace
Max Oazo
Songs: Flowers (remix) (& Miley Cyrus & Bonzana)
Frank Ocean
Songs: Thinkin Bout You - Lost - Super Rich Kids (& Earl Sweatshirt) - Pink + White - Self Control (& Austin Feinstein)
Odetari Songs: Keep Up
Leslie Odom Jr. Songs: Speak Now (One Night in Miami...) - Shape of My Heart (& Josh Groban)
Ofenbach (DJs)
Songs: Shivers (& Ed Sheeran) - Hurricane (& Ella Henderson) - Katchi (& Nick Waterhouse) - Overdrive (& Norma Jean Martine) - Paradise (& Benjamin Ingrosso)
Jacques Offenbach Songs: Les Contes d'Hoffmann : Barcarolle (Belle nuit & ô nuit d'amour) - Can Can (Orphée aux Enfers) - La Vie parisienne : Rondo du brésilien
Official Hige Dandism (Official髭男dism) Songs: Pretender (The Confidence Man JP) - Cry Baby (Tokyo Revengers)
Oklahoma! (film) Songs: Oklahoma (Gordon MacRae, Charlotte Greenwood, James Whitmore, Shirley Jones & Jay C. Flippen)
Oldelaf Songs: Le café (& Monsieur D.) - La tristitude - Et si on chantait (& Monsieur D.) - C'est Michel
Mike Oldfield
See also: Sally Oldfield
Songs: Moonlight Shadow (& Maggie Reilly) - Nuclear (feat. Luke Spiller) - Sailing (& Luke Spiller) - Tubular Bells - To France (& Maggie Reilly)
Olympe
The Voice 2 FR
Songs: Frozen - Hakuna Matata (We Love Disney) - Désenchantée - Zombie - La quête
OMC Songs: How Bizarre
One Night Only Songs: Say You Don't Want It (& Emma Watson)
Onyx Songs: Slam
The Outsiders (musical) Songs: Stay Gold (Sky Lakota-Lynch & Brody Grant)
OV7 Songs: Enloquéceme (Lidia Ávila, Kalimba Marichal & Oscar Schwebel) - Shabadaba - Te quiero tanto, tanto
Buck Owens
Buck Owens & His Buckaroos
Songs: Act Naturally - Crying Time (& His Buckaroos) - Streets of Bakersfield (& Dwight Yoakam) - Keys In The Mailbox - Pfft You Were Gone (Hee Haw Theme)