Here are song, though there are tons more:
"O Holy Night" by Clay Aiken
"O.O.C" by Mariah Carey
"O Canada" - Various
"O Come All Ye Faithful" - Various
"O Holy Night"- Various
"October" - U2
"Oh What a Night" - The Four Seasons
"On the Road Again" - Willie Nelson
"The One" - Elton John / Backstreet Boys
"One" - U2
"One Heart" - Celine Dion
"One Moment in Time" - Whitney Houston
"Only Hope" - Mandy Moore
"Only the Lonely" - The Motels
"Only You"- Ashanti / The Platters
"Open Your Heart" - Madonna
"Ordinary World" - Duran Duran
"Original Sin" - INXS
"The Other Woman" - Ray Parker Jr.
"Over the Rainbow" - Judy Garland
"Octavo Dia" by Shakira
"October Song" by Amy Winehouse
"Off He Goes" by Pearl Jam
"Off The Wall" by Michael Jackson
"Oh" by Ciara
"Oh Daddy" by Fleetwood Mac
"Oh, Father" by Madonna
"Oh! Darling" by The Beatles
"Old Brown Shoe" by The Beatles
"Old Red Wine" by The Who
"Oldest Story In The World" by Heart
"On Any Other Day" by The Police
"On My Way Here" by Clay Aiken
"On The Line" by Demi Lovato
"On The Radio" by Nelly Furtado
"On The Road Again" by Willie Nelson
"One Day In Your Life" by Michael Jackson
Only the Good Die Young - Billy Joel
On Broadway - George Benson
Oblide, Obladah - The Beatles
One Fine Day - The Chiffons
Open Your Heart - Madonna
One Day Too Long - Leann Rimes
Only Yesterday - The Carpenters
Only Believe - E. Presley
One Way or the Other - Blondie
Other Woman, The - Ray Parker Jr.
One Hot Mama - Trace Atkins
Oh, Baby, Baby - L. Ronstadt
Ode to Billie Joe - B. Gentry
One Less Set of Footsteps - J. Croce
One Hell Of A Woman - Mac Davis
One Less Bell To Answer - 5th Dimension
One Fine Morning - Lighthouse
Oh, Happy Day - Glen Campbell
One Broken Heart for sale - Elvis Presley
On and On - G. Knight and the Pips
One Bad Apple - The Osmonds
Oh GIrl, The Chi-Lites
Ohio - Crosby, Stills, Nash and Young
One (is the Loneliest number . . ) THree Dog Night
Old Man - Neil Young
On a Carousel - The Hollies
Operator - Jim Croce
Okie From Muskogee - Merle Haggard
One Man Band - 3 Dog Night
Over, Under, Sideways, Down - The Yardbirds
Over the Hills and Far Away -- Led Zepplin
Out of Sight - James Brown
Our House - Crosby, Stills, Nash and Young
OUr Day Will Come - Frankie Valley
Only When You're Lonely - The Grass Roots
One Mint Julep - Ray Charles
Only The Lonely - R. Orbison
Only Woman - Alice Cooper
O - First Name:
· O.J. Simpson (football)
· Oliver North (soldier & TV commentator)
· Oprah Winfrey (businesswoman & TV personality)
· Otto Graham (football)
Orlando Bloom (actor)
O - Last Name:
· Annie Oakley (sharpshooter entertainer)
· Barack H. Obama (U.S. President)
· Bobby Orr (hockey)
billy ocean rick ocasek
Wilson Pickett Wee Willie Dixon Warren Zevon Wendy O. Williams
Olly Murs
Michael Jackson
Usher Uncle Cracker
Arsenie Todiras, Radu Sarbu, Dan Balan.
Adam Ant Bryan Adams Ryan Adams
Mary J. Blige Toni Braxton
Katy Perry Ke$h@ All I can think of right now...
ourebi
oliver
Oh, dude, singers with last names ending in "o"? Let me think... how about J.Lo? Yeah, Jennifer Lopez counts, right? And there's also Pitbull, if you're into that. But honestly, who even pays attention to last names these days? Just enjoy the music, man.