Related Clues:

• All the voices sound not so low
• Invoices for a couple of dozen sheets, by the sound of it
• The sound of many sheets for them to sing from
• Sounds like a couple of dozen sheets for the singers
• No so low?
• The sound of two dozen single sheets singing
• Psalm group
• See 19
• Love to be surrounded by unusually rich voices
• Cathedral has one: it rates the tops
• Singers in church knocking back port
• Those with strain in voice, one being choked by endless work
• The Hallelujah girls?
• Singers in church, knocking back port
• Either sing together or refrain