Frank Ocean
Songs: Novacane - Slide (feat. Calvin Harris & Migos) - Thinkin Bout You - Super Rich Kids (feat. Earl Sweatshirt) - Sweet Life
Leslie Odom Jr.
See also: Hamilton
Songs: Shape of My Heart (& Josh Groban) - Speak Now (One Night in Miami...)
Ofenbach
Songs: Head Shoulders Knees & Toes (& Quarterhead (feat. Norma Jean Martine)) - Wasted Love (feat. Lagique) - Paradise (feat. Benjamin Ingrosso) - Be Mine - Katchi (feat. Nick Waterhouse)
Mike Oldfield
See also: Sally Oldfield
Songs: Moonlight Shadow (feat. Maggie Reilly) - To France (feat. Maggie Reilly) - Tubular Bells - Shadow on the Wall (feat. Roger Chapman) - Sailing (feat. Luke Spiller)
Fito Olivares Songs: Fin de semana (Cumbia)
Don Omar
Songs: Danza kuduro (feat. Lucenzo) - Dale don dale (feat. Glory) - Dile - Ella y Yo (& Aventura) - Taboo
OMC Songs: How Bizarre
Rita Ora
Songs: Your Song - Big (feat. Imanbek, David Guetta & Gunna) - Bang Bang (& Imanbek) - Ritual (& Tiësto & Jonas Blue) - Anywhere
Orchestral Manoeuvres in the Dark
OMD
Songs: If You Leave (Pretty in Pink) - Maid of Orleans (The Waltz Joan Of Arc) - Enola Gay - Sailing on the Seven Seas
OutKast
Songs: Hey Ya! (Radio Mix - Club Mix) - Int'l Players Anthem (I Choose You) (feat. UGK) - Elevators (Me & You) - The Way You Move (feat. Sleepy Brown) - Roses (feat. Big Boi)
Buck Owens
Buck Owens & His Buckaroos
Songs: Streets of Bakersfield (& Dwight Yoakam) - Together Again - Love's Gonna Live Here - Crying Time (& His Buckaroos) - Act Naturally