O Katy O'Neil Irish, Girls Names
O Sole Mio Enrique Caruso
Ob la di, Ob la da The Beatles
Octopus's Garden The Beatles
Ode to Billy Joe Sinead O'Conner
Of Thee I Sing George Gershwin
Off We Go Into the Wild Blue Yonder Patriotic, United States Air Force Official Song
Oh Babe What Would You Say? Hurricane Smith, One Hit Wonders
Oh Darling The Beatles
Oh Girl The Spinners
Oh Happy Day Nick Cave & The Bad Seed
Oh! How I Hate To Get Up In the Morning Irving Berlin, War Songs
Oh Johnny, Oh Johnny, Oh! Al Jolson, Eddie Cantor, Sophie Tucker, Ziegfeld Follies
Oh Lonesome Me Don Gibson, Johnny Cash
Oh My Pa-pa Eddie Fisher
Oh Susanna Stephen Foster, Traditional
Oh, Them Golden Slippers Traditional
Oh Very Young Cat Stevens
Oh What a Beautiful Morning Rodgers and Hammerstein, Oklahoma, Broadway, Bing Crosby
Oh! You Beautiful Doll!  1911
Okie from Muskogee Merl Haggard, Country
Oklahoma! Rodgers and Hammerstein, Oklahoma, Broadway
Ol' Man River Jerome Kern, Oscar Hammerstein, Showboat, Broadway
Old Cape Cod Patti Page
Old Days Chicago
Old Devil Moon 'Yip' Harburg, Broadway, Finian's Rainbow, Frank Sinatra
Old McDonald Elvis Presley, Sing-a-Long
The Old Piano Roll Blues Cy Coben, Cass Daley, Lawrence Cook, Hoagy Carmichael
Old Songs Barry Manilow
Old Time Rock and Roll Bob Seger and the Silver Bullet Band
Ole Buttermilk Sky  Hoagy Carmichael, Kay Kaiser, Paul Weston
On a Clear Day You Can See Forever Lerner and Loewe, Barbra Streisand, Frank Sinatra, Robert Goulet, Tony Bennett
On a Little Street In Singapore Frank Sinatra, Manhattan Transfer
On and On  Stephen Bishop
On Broadway George Benson, Lieber and Stoller, The Drifters
On the Atchison, Topeka & the Santa Fe Johnny Mercer, Harry Warren, Glenn Miller, Tex Beneke
On the Good Ship Lollipop  Shirley Temple, Rudy Valee
On the Road Again Willie Nelson, Country
On the Street Where You Live Eddie Fisher, Nat 'King' Cole, Lerner and Loewe, Broadway, My Fair Lady
On the Wings of Love Jeffrey Osborne
On This Night of a Thousand Stars Andrew Lloyd-Webber, Broadway, Evita
On Top of Old Smokey Folk, Song
On Top of Spaghetti Sing-a-Long
Once In a Lifetime Broadway, Anthony Newley, Sammy Davis Jr., Stop the World...
Once In Love With Amy Ray Bolger, Frank Leosser
Once Upon a Dream (Sleeping Beauty) Tchaikovsky
Once Upon a Time Broadway, All American, Tony Bennett
One Broadway, Marvin Hamlish, A Chorus Line
One Angry Dwarf and 200 Solemn Faces Ben Folds Five
One Boy Broadway, , Bye Bye Birdie
One Day In Your Life Michael Jackson
One Fine Day Carole King, Chiffons (#5 in 1963), The Carpenters
One For My Baby  Frank Sinatra, Harold Arlen, Johnny Mercer
One Hand, One Heart West Side Story, Broadway, Stephen Sondheim, Johnny Mathis
One Headlight The Wallflowers (1997)
100 Hundred Years Five For Fighting
One In a Million You Larry Graham (1988)
One is the Loneliest Number Three Dog Night, Paul Williams
One Less Bell To Answer Burt Bacharach, Fifth Dimension
One Love Bob Marley
One Moment in Time Whitney Houston
One Note Samba (Samba de Um Nota So) Antonio Carlos Jobim, Ella Fitzgerald
One Of These Nights The Eagles
One Of Those Songs  Shirley Bassey, Liza Minnelli
One of Us Joan Osborne
The One That You Love Air Supply
One Tin Soldier Coven
One-Two-Three Gloria Estefan
One Week Barenaked Ladies
Only Sixteen Dr. Hook
Only the Good Die Young Billy Joel, Movin' Out (Broadway)
Only Yesterday The Carpenters
Only You The Platters
O-o-h Child Dee Dee Sharp
Oom Pah Pah Broadway, Oliver!
Ooo Baby Baby The Miracles, Linda Ronstadt
Oops! I Did It Again Britney Spears
Open A New Window Mame, Broadway, Jerry Herman
Open Arms Journey, Mariah Carey
Open the Door, Richard! Count Basie, Louis Jordan, The Pied Pipers
Operator Manhattan Transfer
Operator (That's Not the Way it Feels) Jim Croce
Orange Colored Sky  Nat 'King' Cole, Natalie Cole
Original Rags Scott Joplin, Instrumental
Our Day Will Come Ruby and the Romantics, The Carpenters, Frankie Valli
Our House Crosby, Stills and Nash
Our Love Is Here To Stay George Gershwin, Nat 'King' Cole
Out of My Dreams Rodgers and Hammerstein, Broadway, Oklahoma!
Over My Head (Cable Car) The Fray (#1 in 2006)
Over the Rainbow Harold Arlen, Yip Harburg, Judy Garland, Movies, Rain, The Wizard of Oz
Over There  George M. Cohan, Patriotic
Over You Gary Pucket and the Union Gap
Overjoyed Stevie Wonder
Oya Como Va Santana