On the Isle of Innisfree James McDunn Mezzo-Soprano, Soprano St. Patrick's Day, Folk, Celtic, Children
Oidche Mhath Leibh Irish Traditional, Hans-Andre Stamm, Hans-André Stamm Soprano, Flute, Harp Celtic, St. Patrick's Day, Folk
Òran Chaluim Sgàire / Iolaire sùil na grèine Julia Gordon Accordion Folk World & Country, Folk, Celtic, St. Patrick's Day
Oran na Maighdinn Mhara Tiffany Schaefer, Eve McTelenn, Julia Gordon Harp, Accordion Celtic, Folk, St. Patrick's Day
Orinoco Flow Nicky Ryan, Celtic Woman, Sarah Cellobat Chaffee, Roma Ryan, Kirby Shaw Guitar, Violin, Viola, Cello, Soprano, Piano Folk World & Country, Easy Listening, alternative, Celtic, Pop
O South Wind Irish Traditional, Hans-Andre Stamm, Hans-André Stamm Piano, Violin Celtic, St. Patrick's Day, Folk
O The Deep Deep Love Of Jesus Patti Drennan, K.L. Phillips, Brenda Portman, Heather Sorenson, Annie Routley, Joseph M. Martin Piano, Alto Saxophone, Viola Classical, Pop, Celtic, Gospel
Oro Se Do Bheatha Bhaile Traditional Irish Folk Song Banjo Folk World & Country, St. Patrick's Day, Celtic, Folk
Ossian and Malwine Irish Traditional, Hans-Andre Stamm, Hans-André Stamm Violin, Piano Folk, Celtic, St. Patrick's Day
One Way Hillsong United, The Levellers, Mark Chadwick, Charles Heather, Marty Sampson, Jonathan Sevink Piano, Guitar, Flute, Recorder, Oboe, Violin Folk, Contemporary Christian, Indie Rock, Celtic, Rock
Hole in the Hedge/Out on the Ocean Traditional Fiddle Tunes, Thomas Quigley, Tom Paxton, Traditional Irish Guitar, Piano, Bass guitar, Violin, Viola, Cello Folk, Country, Celtic, Folk World & Country, St. Patrick's Day
Fantasy and Fugue on "Over the Rainbow", op. 5 Celtic Woman, Alan Jay Lerner, Audrey Snyder, Elise Ecklund, edward shanaphy, E.Y. Harburg Trumpet, Clarinet, Viola, Violin, Cello, Harp Broadway, Traditional Pop, Celtic, Jazz, Children
Over the Sea to Skye Traditional Scottish Folk Song, Annie McLeod, Carrie Lane Gruselle, Roger Emerson, Mary Donnelly, Douglas E. Wagner Piano, Bass, Double Bass Folk World & Country, Stage & Screen, Celtic, Classical, Folk
Over The Hills And Far Away Joanna Borrett, Jean Goberman, Percy Grainger, Myrick Crampton, Gary Moore, English Folk Song Bass, Euphonium, Baritone, Baritone horn, Tuba, Flugelhorn Classical, Boogie Woogie, Blues, Rock & Roll, Metal
Over The Hill John Martyn, Olivia Biskupska Electric guitar, Piano, Guitar Rock, Pop Rock, Stage & Screen, Folk, Pop
Only If Juliano Music, Nicky Ryan Piano, Guitar Celtic, Ethnic Fusion, Adult Alternative, New Age, St. Patrick's Day
