Over Hill, Over Dale 2-Part - Britten, Arr. Kesselman
O Sacrum Convivium - Olivier Messiaen
Once Like A Spark SATB - Neil Ginsberg
Once In The City - Dianna Dennis
O No John! - Arr. Louis Halsey
Open Thou Mine Eyes - John Rutter
On With The Snow! SAB - Arr. Douglas E. Wagner
On Justice, Truth, And Peace SSA - Amy F. Bernon
On Jordan's Bank The Baptist Cry SATB - Arr. Hal H. Hopson
O Quam Tristis (Stabat Mater, No. 3) - Francis Poulenc
Offertory TTBB - Arr. Craig Courtney
Offertory SSA - Arr. Craig Courtney
O Meu Maracatu SATB - Daniel Afonso
O Mary, Don't You Weep TTB - Arr. Rollo Dilworth
O Mary, Don't You Weep SSA - Arr. Rollo Dilworth
O Salutaris Hostia SATB - Pierre De La Rue
Nachtwache (Funf Gesange) - Johannes Brahms
O-Yo-Yo - Arr. Stephen Hatfield
O Magnum Mysterium TTBB - Brian A. Schmidt
O Whistle and I'll Come To Ye SATB - arr. Mack Wilberg
Oceans And Stars SATB - Amy Bernon
O What A Beautiful City - Arr. Shawn Kirchner
O Vos Omnes SATTB - Carlo Gesualdo
Nuit D'Etoiles SSA - Claude Debussy, Arr. Alan Raines
