Related Clues:

• Alternative to humming?
• Part of a merry refrain
• Vocalizer's syllables
• Syllables in a gay refrain
• Refrain from singing when you're happy?
• Cheerful refrain
• Carefree syllables
• Musical refrain start
• Group singing together
• Group of singers as in musicals
• Body of singers
• Organized group of singers
• They don't sound so low
• That does not sound so low
• This does not sound altogether so low