Possible Clues:

• Voices heard in paper, reportedly?
• Confused ostrich losing way in part of church
• "O Holy Night" singers
• Group that may stand on risers
• “O may I join the ____ invisible.” (George Eliot)
• Children look at this river in which bass may appear
• Mass singers
• "Messiah" performance group
• No gaps in cargo ship for the singers
• "Carmina Burana" performers