Possible Clues:

• Is an expression of gratitude not able to have a musical setting?
• Musical piece
• May such a farewell be sung?
• The song 'Goodbye to Prison'
• Is a vote of thanks not able to be so vocal?
• Able to say farewell to anything so vocal
• Preserve farewell musical work
• Is an expression of thanks unable to be sung?
• Is a goodbye able to be sung like this?
• Vocal-orchestral piece