Orange Coloured Sky Deke Sharon, Nat King Cole, Milton Delugg, Peggy Lee, Willie Stein Alto Saxophone, Piano, Guitar Stage & Screen, alternative, Blues, Jazz, Traditional Pop
Organ Grinder Blues Clarence Williams Piano, Guitar, Organ, Electric guitar Blues, Jazz, Boogie Woogie, Pop
One Track Mind Eric Clapton, Craig Carnelia, The Knickerbockers, Marvin Hamlisch, Keith Colley, Kevin Colley Piano, Guitar, Electric guitar Folk, Blues Rock, Rock, Pop, Pop Rock
Opus 70 by John Trie John Trie Organ, Bass guitar, Guitar, Electric guitar, Bass Folk World & Country, Jazz, Blues
Orphan Girl Gillian Welch, Emmylou Harris, Emily Crocker Guitar, Piano Alternative Country, Pop, Blues, Country, Adult Alternative
Orbit Sarah Sadler, Peter Kipley, Bill Evans, Gary Sadler, Hans-Guenter Heumann, Michelle Ayler Piano Blues, Folk, Gospel, Jazz, New Age
Over The Edge Marcel East, John Rottier, David Benoit, Steve Fitch Piano, Percussion Classical, Jazz, Blues
Original Rags Scott Joplin, Gary Blake Peterson, Peter-Lukas Graf, Bernie Schweickart Recorder, Piano, Flute, Guitar, Violin, Viola Classical, Ragtime, Blues, Jazz
Ornithology Benny Harris, W Hudson, Bennie Harris, Jack Grassel, Eddie De Lange, Charlie Parker Piano, Alto Saxophone, Saxophone, Bass, Guitar, Tenor Saxophone Bop, Jazz Standards, Blues, Bebop, Folk
O Pato Elvis Presley, Jon Hendricks, Fabio Eduardo de Oliveira, Neuza Teixeira, Karrin Allyson, Jayme Silva Guitar, Piano, Electric guitar Latin Jazz, Folk World & Country, Bossa Nova, Blues, Latin
