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