Related Clues:

• Perhaps invoices with a slot
• Note how deep these girls get
• There's nothing in the last that makes them so low, by the sound of them
• Low-down types, by the sound of them
• Those low-down women, by the sound of them
• Low-down ladies, by the sound of them
• By the sound of them, those are lowdown women
• 'Than these fish none go deeper, by the sound of them (6)'
• These low-down women, by the sound of them
• Some hers singing hymns
• Certain opera singers
• They get pretty high in church
• Female choir voices
• Lowest female voices
• Boys'-choir voices