A Day on the Mountain David C. Benner, Althea Wray, Wesley Pritchard, Ewart G. Abner Jr., The Magnificents, Florent Schmitt Piano, Flute, Guitar, Oboe, Harp, Clarinet Doo Wop, New Age, Rhythm & Blues, Gospel, Folk World & Country
Open Up Your Arms Ren Harvieu Piano, Guitar Folk, Pop, Indie Pop, Adult Alternative, Alternative Pop/Rock
Ordinary Barenaked Ladies, Bart Hendrickson, Patrick Monahan, Train, Pat Monahan Guitar, Piano, Electric guitar Rock, Folk, Alternative Pop/Rock, Stage & Screen, Adult Alternative
One Sweet World David J. Matthews, Dave Matthews Guitar, Electric guitar Rock, American Trad Rock, Folk, Adult Alternative, Pop Rock
Ordinary Day Vanessa Carlton, Shaina Taub, Toby Anderson Piano, Guitar, Electric guitar Folk, Adult Alternative, Rock, Adult Contemporary, Pop Rock
Orphan Girl Gillian Welch, Emmylou Harris, Emily Crocker Guitar, Piano Alternative Country, Pop, Blues, Country, Adult Alternative
Orpheus Franz Liszt, Franz Schubert, Heinrich Poos, Jacques Offenbach, Sara Bareilles, Tim Wheeler Piano, Guitar, Electric guitar, Organ, Violin, Cello Rock, Pop, Adult Alternative, Pop Rock, Folk
Opened Once Jeff Buckley Piano, Guitar Alternative Rock, Alternative Pop/Rock, Pop, Adult Alternative, Rock
Only Superstition Chris Martin, Guy Berryman, Jonny Buckland, Jon Buckland, Will Champion, Coldplay Guitar, Piano Alternative Pop/Rock, Alternative Rock, Adult Alternative, Rock, Pop Rock
Ordinary Miracle Dave Stewart, Doug Abbott, CAROLE PRIETTO, Rick Hein, Glen Ballard, Sarah McLachlan Alto Saxophone, Piano, Clarinet, Guitar, Flute Children, Adult Alternative, Pop, Folk, Soundtrack
Orinoco Flow Nicky Ryan, Celtic Woman, Sarah Cellobat Chaffee, Roma Ryan, Kirby Shaw Guitar, Piano, Viola, Violin, Cello, Soprano Folk World & Country, Easy Listening, alternative, Celtic, Pop
Our Love Is Easy Jesse Harris, Melody Gardot Piano, Guitar Adult Alternative, Pop, Rock, Contemporary Jazz, Folk
Our Lives Elaine Yu, Aaron Kamin, The Calling Piano, Guitar Adult Alternative, Hard Rock, Indie Rock, Folk, Pop
Our Time Lily Allen, Mac Huff, Greg Kurstin, Stephen Sondheim, Lee Evans, Cathy Pate Soprano, Trumpet, Viola, Piano, Guitar Adult Alternative, Musical, Gospel, Broadway, Classical
Out Of Love Alessia Cara, Gregg Wattenberg, John Ondrasik, Five For Fighting, Dan Signor, Marcy Heisler Piano, Guitar, Electric guitar Post-Grunge, Adult Alternative, Pop Rock, Pop, Alternative Pop/Rock
Out Of The Blue Bryan Ferry, Andrew Lippa, Guy Chambers, Debbie Gibson, Miles Davis, Hubert Bath Piano, Electric guitar, Guitar, Flute, Clarinet, Tenor Saxophone Pop, Adult Alternative, Broadway, Boogie Woogie, Alternative Pop/Rock
Original Of The Species Guitar, Piano, Electric guitar Dance-pop, Adult Alternative, Pop, Pop Rock, Rock
Orchid Yanni, Eric Sanicola, Eric John Sanicola, Steven Kudlo Piano, Guitar Folk, New Age, Adult Alternative, Pop
Opportunity William Gluck, Jason Robert Brown, The Music, Juan Villodre, Yeah Yeah Yeahs, Charles Strouse Piano, Guitar, Electric guitar Folk, Pop, Indie Pop, Stage & Screen, Soundtrack
Overdue Matthew Bellamy, Billy Mann Guitar, Piano Britpop, Adult Alternative, Progressive Rock, Brit-Pop, Folk
