Related Clues:

• Start of a refrain
• Lilt syllable
• Response to pyrotechnics
• Carefree singing syllable
• Sound of delight
• 'Nice!'
• Gasp of delight
• Refrain snippet
• "Oh wow!"
• Reaction to fireworks
• "Wow!"
• Delighted exclamation
• Part of a chorus line?
• La la forerunner
• Audible admiration