Omnes Gentes SSAA - Jacob Narverud
Old Friends SATB - arr. Fred Sturm
Oh, Won't You Sit Down 2-Part - Greg Gilpin
Oh, Sinner Man SAB - arr. Russell Robinson
Skye Boat Song 2-Part - arr. Lois Fiftal
On Eagles Wings SATB - arr. Douglas E. Wagner
Siyahamba 3-Part Treble - arr. Ruth Morris Gray
Oh, How Good It Is SATB - arr. Joshua Spacht
Oh! Susanna TB - arr. Ken Berg
Oh Winter SSAA - Moira Smiley
Oh Santa! SSA - arr. Mike Taylor
Oh Happy Day 3-Part Mixed - arr. Roger Emerson
O Salutaris Hostia SATB - Gioacchino Rossini
O Salutaris (Messe Breve) 2-Part - Leo Delibes, ed Dan Krunnfusz
O sacrum convivium SSA - Giorgio Susana, ed. Z. Randall Stroope
O sacrum convivium SATB - William Byrd
Ocho Kandelikas Unison - arr. Alicia Shumate
O Sacrum Convivium SATB - Roberto Remondi
O sacrum convivium SATB - Giovanni Croce
O quam suavis SATB - Sebastian de Vivanco
O, Desayo 2-Part - arr. Elliot Z. Levine
O Praise the Lord, All Ye Nations SATB - Amy Beach
O Nata Lux 3-Part Mixed - Tom Porter
O My Luve's Like a Red Red Rose SATB - Douglas E. Wagner
