O Sing Rejoice! SATB - Handel, ed. Patrick M. Liebergen
O Praise the Mighty Lord (Joshua) SATB - Handel, ed. Patrick M. Liebergen
O Praise The Lord With Heart And Voice SSA - Haydn, Arr. Jacob Narverud
O Sing Joyfully SAB - Adrian Batten, Ed. Thoburn
O Praise The Lord SAB - Adrian Batten; Ed. Thoburn
On A March Day SATB - Richard Burchard
Omnis Terra! (Jubilate Deo) SATB - Dan Forrest
Offertory TTBB - Arr. Craig Courtney
Omnis Terra (Jubilate Deo) Treble Voices - Dan Forrest
Omnia Sol SSA - Z. Randall Stroope
Offertorium (War Requiem) - Benjamin Britten
Omnes Credere SATB - Jim Papoulis, Ed. Sophia Papoulis
Of The Father's Love Begotten TTBB - Arr. Edwin T. Childs
O Salutaris Hostia SATB - Pierre De La Rue
Of A Rose, A Lovely Rose (Magnificat) - John Rutter
O Magnum Mysterium TTBB - Morten Lauridsen
O Salutaris Hostia SSAA - Erik Esenvalds
O Magnum Mysterium TTBB - Manolo Da Rold
O Sacrum Convivium TTBB - Tomas Luis De Victoria
O Magnum Mysterium TTBB - Brian A. Schmidt
Ocho kandelikas SATB - Arr. Joshua Jacobson
My Wordless Prayer SATB - Craig Courtney
O Vos Omnes TTBB - Tomas Luis De Victoria
O Magnum Mysterium TTB - Evan Ramos
