O Little Town of Bethlehem - Elvis Presley

O Little Town of Bethlehem - Sarah McLachlan

O Maria - Beck

O Mexico - Trisha Yearwood

O Mio Babbino Caro - Charlotte Church

O Mio Babbino Caro - Sarah Brightman

O My God - The Police

O Neul Geu Dael Bon Da Myeon (If You Were Here) - BoA

O Sacred Head - Amy Grant (My Father’s Eyes)

O Siem - Susan Aglukark (This Child)

O Soave Fanciulla - Michael Bolton (My Secret Passion)

O Soave Fanciulla - Andrea Bocelli

O Sole Mio - Bryan Adams

O Stella - PJ Harvey

O Superman - Laurie Anderson (Big Science)

O The Glory of His Presence - Karen Clark-Sheard

O They Tell Me of a Home Far Beyond The Skies - Don Henley (I Can’t Stand Still)

O Valencia! - The Decemberists

O' Come All Ye Faithful - All-4-One (An All 4 One Christmas)

O' Come All Ye Faithful - Luther Vandross

O' Holy Night - Destiny's Child (8 Days Of Christmas)

O' Sailor - Fiona Apple

O'malley's Bar - Nick Cave (Murder Ballads)

O, Holy Night - Clay Aiken

O-We-O-O - Pogues (Hell’s Ditch)

O. Lover - Jason Mraz

O.a.V.I.P. - The Maccabees new!

O.D.H.G.A.B.F.E. - Lamb Of God

O.K. - Ani Difranco (Reckoning/Revelling: Reckoning Disc)

O.T. (Skit) - Cam'ron

Oasis - Puya (Fundamental)

Ob-La-Di, Ob-La-Da - The Beatles (The Beatles)

Ob-La-Di, Ob-La-Da - No Doubt

Obezyanka Nol - t.A.T.u.

Obie Story - Obie Trice

Obizienka Nol - t.A.T.u.

Object of My Affection - Shawn Colvin

Objection - Shakira (Laundry Service)

Objection (Afro Punk Remix) - Shakira (Laundry Service Washed and Dried)

Objective - Planet Smashers

Objects in The Mirror - Prince

Oblivion - Macy Gray (The ID)

Oblivion - Project 86 (Songs To Burn Your Bridges)

Oblivion - 30 Seconds To Mars (30 Seconds To Mars)

Oborodukiyo Inori - Mika Nakashima

Obscure - Dir en Grey

Obscured - Smashing Pumpkins

Obsequy (The Death of Art) - Marilyn Manson

Obsessed W/Childhood - Bif Naked

Obsession - Kelly Rowland (Simply Deep)