On My Heart Imprint Thine Image SATB - Paul Manz
On Jordan's Stormy Banks I Stand SATB - Hal H. Hopson
On Christmas Night SATB - Mark Burrows
O Thou Who Camest From Above SATB - Philip Lawson
On Christmas Night SATB - Gerald Near
Old Man Winter 2-Part - Lois Brownsey and Marti Lunn Lantz
Old King Cole SATB - arr. Donald P. Moore
Old Dan Tucker SSA - arr. John Leavitt
Old Abram Brown SSAA - Benjamin Britten
Oh, No! SSA - Ruth Morris Gray
Oh Happy Day SATB - arr. Kirby Shaw
Oh Beloved SATB - Kim André Arnesen
Offertory SATB - John Ness Beck
Offertory (Requiem) SSA - Gabriel Faure, arr. Desmond Ratcliffe
O sing, my tongue, of the mystery SATB - Frank Pesci
O Sing to the Lord a New Song SATB - Michael Burkhardt
O Sifuni Mungu SSAA - arr. Roger Emerson
Of the Father's Love Begotten SATB - Terre Johnson
O Sifuni Mungu SAB - arr. Roger Emerson
O Say, Can You See TTB - Ruth Morris Gray
Ocho kandelikas 2-Part - arr. Joshua Jacobson
O Saviour of the World SATB - John Goss (with organ)
Obwisana TB - arr. Victor C. Johnson
O Sacrum Convivium SATB - James Biery
