Possible Clues:

• Voice raised in river brawl?
• Raised voice in argument after short trip
• Artificially high singing tones
• Almost collapse before argument in shrill voice
• Bit of Queen's 'Bohemian Rhapsody'
• Raised voice from call centre in loud argument
• Raised voice in brief row after trip cut short
• Fine male voice incorporating fixed high notes?
• Voice raised in row by Cornish river
• Singer prepared to board wacky float