Possible Clues:

• Musical conclusion
• Last part of song
• Backing out of tortuous final passage
• Last piece of music recorded twice by a UN secretary-general?
• A final part of a musical work
• Boutros Boutros-Ghali's repeated conclusion
• Closing bars best at Henley, perhaps, when whiskey’s run out
• The one in 'Layla' lasts 3 minutes 48 seconds
• Closing section
• Musical finish