| Title | Artist | Song # |
| O Come All Ye Faithful | Traditional | 7-66 |
| O Holy Night | Traditional | 7-67 |
| O Little Town Of Bethlehem | Traditional | 7-68 |
| O.M.G. | Usher & Will.I.Am | 368-2 |
| Ob La Di, Ob La Da | Beatles, The | 221-7 |
| Objection Tango | Shakira | 32-58 |
| Objects In The Rear View Mirror | Meat Loaf | 386-8 |
| Obvious | Aguilera, Christina | 81-8 |
| Ocean Front Property | Strait, George | 270-46 |
| Ocean Front Property | Strait, George | 9-87 |
| Octopus Garden | Beatles, The | 357-8 |
| Octopus Garden | Beatles, The | 2-16 |
| Ode To Billy Joe | Gentry, Bobbie | 279-7 |
| Ode To My Car | Sandler, Adam | 105-16 |
| Off The Wall | Jackson, Michael | 26-17 |
| Oh Boy | Holly, Buddy | 69-14 |
| Oh Boy | Holly, Buddy | 8-85 |
| Oh Boy | Holly, Buddy w/vocal | 69-4 |
| Oh Boy | Mud | 154-7 |
| Oh Carol | Smokie | 261-10 |
| Oh Christmas Tree | Traditional | 11-70 |
| Oh Dianne | Fleetwood Mac | 149-11 |
| Oh Girl | Chi Lites, The | 283-45 |
| Oh Girl | Young, Paul | 240-13 |
| Oh Girl | Young, Paul | 7-34 |
| Oh Happy Days | Hill, Lauryn | 408-9 |
| Oh Lonesome Me | Gibson, Don | 314-21 |
| Oh Lonesome Me | Kentucky Headhunters, The | 272-13 |
| Oh Mother | Aguilera, Christina | 350-9 |
| Oh My God | Kaiser Chiefs | 63-13 |
| Oh My God | Maria, Ida | 208-12 |
| Oh My God | Mark Ronson ft Lily Allen | 338-6 |
| Oh My Pa Pa | Fisher, Eddie | 291-29 |
| Oh No Not My Baby | Rondstadt, Linda | 28-9 |
| Oh No Not My Baby | Ronstadt, Linda | 238-5 |
| Oh Pretty Woman | Orbison, Roy | 273-11 |
| Oh Santa | Carey, Mariah | 398-16 |
| Oh Sheila | Ready For The World | 308-48 |
| Oh Sherrie | Perry, Steve | 233-6 |
| Oh Stacey | Zutons, The | 379-10 |
| Oh What A Night | Dells, The | 21-29 |
| Oh What A Night | Dells, The | 306-40 |
| Oh What A Thrill | Mavericks, The | 2-71 |
| Oh What It Did To Me | Tucker, Tanya | 315-46 |
| Okie From Muskogee | Haggard, Merle | 269-33 |
| Okie From Muskogee | Haggard, Merle | 8-55 |
| Oklahoma | Gilman, Billy | 302-37 |
| Oklahoma Swing | McEntire, Reba & Vince Gill | 318-31 |
| Ol Man River | Grant, Earl | 29-43 |
| Ol' Red | Shelton, Blake | 7-16 |
| Ol' Red | Shelton, Blake | 290-29 |
| Old Before I Die | Williams, Robbie | 53-8 |
| Old Dogs, Children And Watermelon Wine | Hall, Tom T | 312-16 |
| Old Enough To Know Better | Hayes, Wade | 23-8 |
| Old Flame | Alabama | 270-27 |
| Old Flames Can't Hold A Candle | Parton, Dolly | 315-17 |
| Old Flames Have New Names | Chesnutt, Mark | 302-1 |
| Old Friend | Hyman, Phyllis | 256-12 |
| Old Macdonald | Children's Favourites | 286-50 |
| Old Man And Me | Hootie & The Blowfish | 14-20 |
| Old Rugged Cross | Traditional | 8-86 |
| Old Songs, The | Manilow, Barry | 67-10 |
| Old Stuff, The | Brooks, Garth | 1-38 |
| Old Time Rock And Roll | Seger, Bob | 275-46 |
| Older Woman | Hill, Benny | 150-16 |
| Older Women | McDowell, Ronnie | 300-48 |
| Oldest Swinger In Town | Wedlock, Fred | 142-13 |
| Oldest Swinger In Town, The | Wedlock, Fred | 349-11 |
| Ole Black And Blue Eyes | Fratellis | 338-8 |
| Olivers Army | Costello, Elvis | 363-6 |
| On A Bus To St Cloud | Yearwood, Trisha | 35-47 |
| On A Clear Day | Streisand, Barbra | 11-53 |
| On A Mission | Trick Pony | 290-31 |
| On A Mission | Trick Pony | 7-49 |
| On A Night Like This | Trick Pony | 302-47 |
| On A Night Like This | Trick Pony | 6-59 |
| On A Slow Boat To China | Ford, Emile & The Checkmates | 152-14 |
| On And On | Badu, Erykah | 294-13 |
| On And On | Bishop, Stephen | 252-17 |
| On And On | Long Pigs, The | 180-7 |
| On Bended Knee | Boyz II Men | 192-10 |
| On Bended Knee | Boyz II Men | 285-13 |
| On Bended Knee | Boyz II Men | 16-77 |
| On Broadway | Benson, George | 127-3 |
| On Broadway | Drifters, The | 291-39 |
| On London Bridge | Stafford, Jo | 225-9 |
| On My Knees | JacI'velasquez | 311-16 |
| On My Own | Mcdonald Labell | 25-6 |
| On Second Thought | Rabbitt, Eddie | 288-50 |
| On Silent Wings | Turner, Tina | 28-23 |
| On Th Good Ship Lollipop | Temple, Shirley | 175-12 |
| On The Amazon | McClean, Don | 185-15 |
| On The Beach | Rea, Chris | 167-12 |
| On The Border | Stewart, Al | 396-2 |
| On The Dark Side | Cafferty, John | 101-11 |
| On The Floor | Lopez, Jennifer & Pitbull | 409-1 |
| On The Other Hand | Travis, Randy | 272-9 |
| On The Radio | Furtado, Nelly | 31-89 |
| On The Radio | Sommers, Donna | 120-1 |
| On The Road Again | Nelson, Willie | 91-5 |
| On The Road Again | Nelson, Willie & Jennings | 119-8 |
| On The Side Of Angels | Rimes, LeAnn | 3-83 |
| On The Street Where You Live | Connick, Harry Jr | 8-65 |
| On The Street Where You Live | My Fair Lady | 106-6 |
| On The Street Where You Live | Soundtrack | 225-13 |
| On The Sunny Side Of The Street | Fitzgerald, Ella | 225-11 |
| On The Wings Of Love | Osborne, Jeffery | 115-5 |
| On The Wings Of Love | Osborne, Jeffery | 25-59 |
| On Top Of Old Smoky | Children's Favourites | 290-49 |
| Once | Vickers, Diana | 368-15 |
| Once A Day | Smith, Connie | 278-4 |
| Once Bitten Twice Shy | Hunter, Ian | 388-9 |
| Once Bitten, Twice Shy | Great White | 321-28 |
| Once In A While | Dishwalla | 29-38 |
| Once More With Feeling | Lewis, Jerry Lee | 314-42 |
| One | A Chorus Line | 8-87 |
| One | Chorus Line, A | 133-14 |
| One | Three Dog Night | 292-18 |
| One | U2 | 365-8 |
| One (Your Name) | Swedish House Mafia & Pharrell | 389-9 |
| One Bad Apple | Osmonds, The | 292-26 |
| One Believer | Diamond Rio | 317-12 |
| One Better Day | Madness | 406-8 |
| One Boy | Sommers, Joanie | 226-14 |
| One Boy One Girl | Ray, Collin | 1-24 |
| One Boy, One Girl | Raye, Collin | 98-16 |
| One By One | Cher | 27-27 |
| One Day At A Time | Gospel Southern | 291-3 |
| One Day At A Time | TV Theme | 30-7 |
| One Day In Your Life | Anastacia | 22-50 |
| One Day Left To Live | Kershaw, Sammy | 36-44 |
| One Fine Day | Chiffons, The | 274-33 |
| One Fine Day | Chiffons, The | 12-80 |
| One Fine Day | King, Carole | 124-13 |
| One For My Baby | Bennett, Tony | 10-24 |
| One For My Baby | Sinatra, Frank | 7-11 |
| One For My Baby | Sinatra, Frank | 100-13 |
| One For Sorrow | Steps, The | 50-5 |
| One For The Radio | McFly | 202-6 |
| One Has My Name, The Other Has My Heart | Wakely, Jimmy | 314-12 |
| One Headlight | Wall Flowers, The | 15-2 |
| One I Love, The | Minogue, Kylie | 201-13 |
| One In A Million | Graham, Larry | 115-18 |
| One In A Million | Lee, Johnny | 315-19 |
| One In Ten | UB40 | 260-7 |
| One Kiss From You | Spears, Britney | 21-58 |
| One Last Breath | Creed | 322-14 |
| One Last Breath | Creed | 22-49 |
| One Less Bell To Answer | Fifth Dimension, The | 291-49 |
| One Less Bell To Answer | Fifth Dimension, The | 12-81 |
| One Moment In Time | Houston, Whitney | 41-16 |
| One Moment In Time | Houston, Whitney | 12-82 |
| One More Chance | Bloc Party | 215-16 |
| One More Day | Diamond Rio | 289-34 |
| One More For My Baby | Franklin, Lynn | 137-13 |
| One More Kiss Dear | Percival, Don | 181-7 |
| One More Last Chance | Gill, Vince | 11-35 |
| One More Night | Collins, Phil | 308-30 |
| One More Try | Michael, George | 294-30 |
| One More Try | Thomas, Timmy | 23-39 |
| One Night | Presley, Elvis | 131-17 |
| One Night A Day | Brooks, Garth | 11-36 |
| One Of These Nights | Eagles, The | 187-3 |
| One Of These Nights | Eagles, The | 25-47 |
| One Of Us | Osborne, Joan | 14-19 |
| One Of Us | Osborne, Joan | 277-34 |
| One Peice At A Time | Cash, Johnny | 197-9 |
| One Promise Too Late | McEntire, Reba | 301-23 |
| One shot | JLS | 362-8 |
| One Step At A Time | Buddy, Jewel | 34-48 |
| One Step At A Time | Sparks, Jordin | 208-13 |
| One That You Love | Air Supply | 277-49 |
| One Thing Leads To Another | Fixx, The | 101-8 |
| One Time | Bieber, Justin | 171-5 |
| One time | Bieber, Justin | 362-10 |
| One Tin Soldier The Legend Of B | Coven | 275-11 |
| One Toke Over The Line | Brewer & Shiple | 282-43 |
| One Voice | Gilman, Billy | 281-11 |
| One Voice | Gilman, Billy | 20-78 |
| One Way Out | Allman Brothers, The | 97-10 |
| One Way Ticket | Rimes, LeAnn | 2-17 |
| One Way Ticket | Rimes, LeAnn | 272-35 |
| One You Love The Most, The | Astley, Rick | 137-3 |
| One, The | Backstreet Boys, The | 294-35 |
| One, The | John, Elton | 255-16 |
| Oney | Cash, Johnny | 279-12 |
| Only Girl (In The World) | Rihanna | 393-5 |
| Only God Knows Why | Kid Rock | 286-1 |
| Only God Knows Why | Kid Rock | 20-43 |
| Only In America | Brooks & Dunn | 290-2 |
| Only Lonely | Hootie & The Blowfish | 29-66 |
| Only On Days That End In Y | Anderson, Clay | 1-55 |
| Only One Woman | Bee Gees, The | 252-11 |
| Only Sixteen | Cooke, Sam | 147-5 |
| Only Sixteen | Dr. Hook | 261-3 |
| Only Sixteen | Dr. Hook | 406-13 |
| Only The Good Die Young | Joel, Billy | 284-32 |
| Only The Lonely | Orbison, Roy | 70-19 |
| Only Time | Enya | 295-5 |
| Only When I Love | Dunn, Holly | 301-19 |
| Only Yesterday | Carpenter, Mary Chapin | 27-52 |
| Only You | Platters, The | 7-2 |
| Only You | Platters, The | 369-12 |
| Only You | Platters, The | 231-13 |
| Only You | Smokie | 261-13 |
| Only You And I Know | Clapton, Eric | 110-11 |
| Only You And You Alone | Platters, The | 283-49 |
| Ooh Ahh Just A Little Bit | Gina G | 17-9 |
| Ooh Child | 5 Stairsteps | 320-11 |
| Ooh Child | Five Stairsteps | 7-18 |
| Ooh La | Kooks, The | 380-13 |
| Ooh La La | Goldfrapp | 373-2 |
| Ooh La La | Stewart, Rod | 18-86 |
| Oops (Oh My) | Tweet | 80-8 |
| Oops! I Did It Again | Spears, Britney | 286-22 |
| Oops! I Did It Again | Spears, Britney | 20-60 |
| Oopsy Daisy | Chipmunks, The | 216-7 |
| Open Arms | Journey | 15-9 |
| Open Arms | Journey | 284-35 |
| Open Invitation | Santana | 21-23 |
| Open Invitation | Santana, Carlos | 97-8 |
| Open My Heart | Adams, Yolanda | 285-26 |
| Open Your Eyes | Snow Patrol | 328-13 |
| Open Your Heart | Madonna | 232-2 |
| Open Your Heart | Madonna | 347-10 |
| Operator (That's Not The Way It Feels) | Croce, Jim | 18-6 |
| Operator (That's Not The Way It Feels) | Croce, Jim | 292-35 |
| Opposites Attract | Abdul, Paula | 23-40 |
| Ordinary Day | Carlton, Vanessa | 163-15 |
| Ordinary Day | Carlton, Vanessa | 32-63 |
| Ordinary Life | Brock, Chad | 289-25 |
| Ordinary Miracles | Streisand, Barbra | 28-38 |
| Organ Grinders Swing | Four Preps, The | 254-16 |
| Original Os The Species | U2 | 200-10 |
| Other Side | McCready, Mindy | 302-29 |
| Otherside | Red Hot Chili Peppers, The | 20-42 |
| Ouch | N | 206-6 |
| Our Day Will Come | Ruby & The Romantics | 305-50 |
| Our House | Crosby, Stills & Nash | 149-9 |
| Our Love Is Here To Stay | Cole, Nat King | 12-83 |
| Our Love Is On The Faultline | Gayle, Crystal | 85-14 |
| Our Song | Swift, Taylor | 368-6 |
| Our Time Now | Plain White T's | 354-13 |
| Our Velocity | Maximo Park | 332-4 |
| Out Of My Head | Fastball | 19-60 |
| Out Of My Heart | BBMak | 32-48 |
| Out Of Your Shoes | Morgan, Lorrie | 288-46 |
| Out Tonight | Rent | 5-44 |
| Outbound Plane | Bogguss, Suzy | 301-50 |
| Outta Here | Denters, Esmee | 215-7 |
| Over And Over | Nelly & Tim McGraw | 63-3 |
| Over And Over | Nelly & Tim McGraw | 322-46 |
| Over My Head (Cable Car) | Fray, The | 336-7 |
| Over The Rainbow | Garland, Judy | 12-84 |
| Overkill | Men At Work | 243-12 |
| Overload | Sugababes, The | 372-5 |
| Overnight Male | Strait, George | 10-64 |
| Overprotected | Spears, Britney | 161-13 |
| Overprotected | Spears, Britney | 22-37 |
| Oxford Comma | Vampire Weekend | 360-3 |
| Oye Come Va | Santana, Carlos | 238-8 |
| Oye Como Va | Santana | 21-22 |