Possible Clues:

• Rosh Hashanah trumpet
• Rosh Hashanah horn
• Ram's-horn horn
• Synagogue ram's horn
• It blew in the clash of armies
• Instrument made from a ram's horn
• Synagogue instrument
• Ram's horn used as an instrument
• Hebrew horn
• Ram's horn sounded in the synagogue daily during the month of Elul