Orchids Shawn Economaki, Josh Rand, Joel Ekman, Stone Sour Gitarre, E-Gitarre Rock, Alternative Rock, Metall
Ordinary Barenaked Ladies, Bart Hendrickson, Patrick Monahan, Train, Pat Monahan Gitarre, Klavier, E-Gitarre Alternative Pop/Rock, Erwachsene Alternative, Pop Rock, Bühne & Leinwand, Rock
Ordinary Love David Evans, Brian Burton, Dan Truman, The Edge, Adam Clayton, Bob DiPiero Schlagzeug, Gitarre, Klavier Country, Rock, Pop, Pop Rock, Volksmusik
One Road Jussi Kontinen, Steven Lee Lukather, Randy Goodrum, Steve Lukather, David Paich, Sick Boy Tenor, Schlagzeug, E-Gitarre, Gitarre Pop, Pop Rock, Rock, Soft Rock
One Sweet World David J. Matthews, Dave Matthews Gitarre, E-Gitarre Volksmusik, Erwachsene Alternative, Jam Band, Alternative Pop/Rock, Amerikanischer Trad Rock
Ordinary Day Vanessa Carlton, Shaina Taub, Toby Anderson Klavier, Gitarre, E-Gitarre Pop, Pop Rock, Easy Listening, Rock, Erwachsene Contemporary-Musik
I Exalt Thee / Open the Eyes of My Heart Mark Hayes, Larry Shackley, Deborah Brady, Ken Medema, Stephen DeCesare, Paul Baloche Gitarre, Klavier, Violine, Flöte, Cello, Ukulele Pop Rock, Evangelium, Bühne & Leinwand, Rock, Pop
Open Up Your Door Julie Doubleday, Richard Hawley Klavier, Gitarre, E-Gitarre, Violine, Bratsche, Cello Pop, Volksmusik, Alternative, Rock
Operation Ouch Dobs Vye, Jose Ignacio Huante Ceron, Jess Charles Klavier Kinder, Oper, Rock, Pop, Bühne & Leinwand
Original Sin Andrew Charles Farriss, Elton John, Andrew Farriss, Michael Hutchence, Bill Bruford, Michael Kelland John Hutchence Gitarre, E-Gitarre, Klavier, Kontrabass, Sopran-Saxophon Neue Welle, Dance-Pop, Volksmusik, Jazz, College Rock
Orion Cliff Burton, Metallica, James Hetfield, Gabriela Quintero Lopez, Lars Ulrich, Rodrigo y Gabriela Gitarre, E-Gitarre Hard Rock, Metall, Flamenco, Pop Rock, Folk Welt und Land
Orphan Girl / Travelin' Man Chris Miller Klavier, Gitarre Musical, Pop, Rock, Bühne & Leinwand, Traditioneller Pop
One Track Mind Eric Clapton, Craig Carnelia, The Knickerbockers, Marvin Hamlisch, Keith Colley, Kevin Colley Klavier, Gitarre, E-Gitarre Blues Rock, Blues, Pop, Musical, Bühne & Leinwand
One Vision Brian May, Freddie Mercury, John Deacon, Philip Lawson, Roger Taylor, Queen Klavier, Gitarre, Bass, E-Gitarre, Schlagzeug Album Rock, Rock, Art-Rock/Progressive, Progressive Rock, Glam Rock
Only a Dream in Rio James Taylor Klavier, Gitarre Pop, Soft Rock, Rock, Erwachsene Contemporary-Musik, Folk Rock
