| Title | Artist | Song # |
| O Come All Ye Faithful | Sara Evans | 4-935 |
| O Come All Ye Faithful | Traditional | 1-660 |
| O Holy Night | Celine Dion | 4-897 |
| O Holy Night | Traditional | 1-661 |
| O Little Town Of Bethlehem | Emmylou Harris | 4-940 |
| O Little Town Of Bethlehem | Traditional | 1-662 |
| Ob La Di Ob La Da | Beatles | 3-916 |
| Objection Tango | Shakira | 3-721 |
| Ocean Front Property | George Strait | 1-879 |
| Octopus Garden | Bealtes | 1-115 |
| Ode To Billy Joe | Bobby Gentry | 4-423 |
| Off The Wall | Michael Jackson | 3-139 |
| Oh Atlanta | Little Feat | 4-967 |
| Oh Boy | Buddy Holly | 1-778 |
| Oh Christmas Tree | Traditional | 1-1060 |
| Oh Girl | Paul Young | 1-628 |
| Oh Happy Day | Elvis Presley | 4-669 |
| Oh No Not My Baby | Linda Ronstadt | 3-276 |
| Oh Pretty Woman (Karaoke Mix) | Roy Orbison | 4-502 |
| Oh Pretty Woman (With Vocals) | Roy Orbison | 4-512 |
| Oh What A Night | Dells | 2-756 |
| Oh What A Thrill | Mavericks | 1-170 |
| Oh, Pretty Woman | Roy Orbison | 4-775 |
| Okie From Muskogee | Merle Haggard | 4-392 |
| Okie From Muskogee | Merle Haggard | 1-748 |
| Ol Man River | Earl Grant | 3-409 |
| Ol Red | Blake Shelton | 1-610 |
| Old Enough To Know Better | Wade Hayes | 2-933 |
| Old Man | Neil Young | 4-585 |
| Old Man And Me | Hootie And The Blowfish | 2-54 |
| Old Rugged Cross | Traditional | 1-779 |
| Old Time Rock 'N' Roll | Bob Seger | 4-781 |
| On A Bus To St. Cloud | Trisha Yearwood | 3-1007 |
| On A Clear Day | Barbara Streisand | 1-1043 |
| On A Mission | Trick Pony | 1-643 |
| On A Night Like This | Trick Pony | 1-554 |
| On Bended Knee | Boyz Ii Men | 2-309 |
| On My Own | Mcdonald/Labelle | 3-29 |
| On Silent Wings | Tina Turner | 3-290 |
| On The Radio | Nelly Furtado | 3-653 |
| On The Road Again | Willie Nelson | 4-317 |
| On The Side Of Angels | Leann Rimes | 1-281 |
| On The Street Where You Live | Harry Connick Jr. | 1-758 |
| On The Wings Of Love | Jeffery Osborne | 3-82 |
| Once In A While | Dishwalla | 3-404 |
| One | A Chorus Line | 1-780 |
| One Boy One Girl | Collin Ray | 1-24 |
| One By One | Cher | 3-195 |
| One Day At A Time | TV Theme | 3-472 |
| One Day In Your Life | Anastacia | 2-876 |
| One Day Left To Live | Sammy Kershaw | 4-3 |
| One Fine Day | Chiffons | 1-1169 |
| One For My Baby | Frank Sinatra | 1-605 |
| One For My Baby | Tony Bennett | 1-915 |
| One Headlight | Wallflowers | 2-135 |
| One Kiss From You | Britney Spears | 2-785 |
| One Last Breath | Creed | 2-875 |
| One Less Bell To Answer | The Fifth Dimen | 1-1170 |
| One Moment Time | Whitney Houston | 1-1171 |
| One More Last Chance | Vince Gill | 1-1025 |
| One More Try | Timmy T. | 2-964 |
| One Night A Day | Garth Brooks | 1-1026 |
| One Of These Nights | Eagles | 3-70 |
| One Of Us | Joan Osborne | 2-53 |
| One Step At A Time | Buddy Jewel | 3-909 |
| One Voice | Billy Gilman | 2-706 |
| One Way Ticket | Leann Rimes | 1-116 |
| Only Believe | Elvis Presley | 4-659 |
| Only Believe - ChartBuster | Elvis Presley | 4-694 |
| Only God Knows Why | Kid Rock | 2-671 |
| Only Lonely | Hootie And The Blowfish | 3-432 |
| Only On Days That End In Y | Clay Anderson | 1-55 |
| Only The Good Die Young | Billy Joel | 4-724 |
| Only The Lonely | Roy Orbison | 4-580 |
| Only The Young | Journey | 4-736 |
| Only Want To Be With You | Hootie And The Blowfish | 2-55 |
| Only Yesterday | Carpenters | 3-220 |
| Only You | Platters | 1-596 |
| Only You | The Platters | 4-346 |
| Ooh Ahh Just A Little Bit | Gina G | 2-340 |
| Ooh Child | Five Stairsteps | 1-612 |
| Ooh La La | Rod Stewart | 2-516 |
| Ooh La La | Rod Stewart | 4-845 |
| Ooo Baby Baby (Karaoke Mix) | The Miracles | 4-504 |
| Ooo Baby Baby (With Vocals) | The Miracles | 4-514 |
| Oops...I Did It Again | Britney Spears | 2-688 |
| Open Arms | Journey | 2-142 |
| Open Arms | Journey | 4-735 |
| Open Invitation | Santana | 2-750 |
| Operator | Jim Croce | 2-436 |
| Ophelia | The Band | 4-984 |
| Opposites Attract | Paula Abdul | 2-965 |
| Ordinary Day | Vanessa Carlton | 3-726 |
| Ordinary Miracles | Barbra Streisand | 3-305 |
| Otherside | Red Hot Chili Peppers | 2-670 |
| Our Love Is Here To Stay | Nat King Cole | 1-1172 |
| Out In The Country | Three Dog Night | 4-744 |
| Out Of My Head | Fastball | 2-589 |
| Out Of My Heart | Bbmak | 3-711 |
| Out Tonight | Rent | 1-440 |
| Over The Rainbow | Judy Garland | 1-1173 |
| Overnight Male | George Strait | 1-955 |
| Overprotected | Britney Spears | 2-863 |
| Oye Como Va | Santana | 2-749 |