Related Clues:

• Don't do that - it's a song
• Kindly desist - from song?
• The repeated lines at the end of verses
• That tune may be fine, but not so fine for the referee
• Will he make music on the whistle before it's wet?
• Don't be so inclined to be so musical
• The air makes the referee wet
• Stop oneself from doing something
• 'Fa la la la la la la la la,' e.g
• It's sung more than once
• Chorus of 'don'ts'?
• Abstain from repetitive strain
• The judge drops repeated lines
• Hold back the chorus
• Hold the burden