Possible Clues:

• Ultimate performance of number synonymous with The Children of Lir
• Final act
• Final performance of Freebird lyric perhaps
• Galsworthy's final work
• A bird's last lay
• Last performance of a career
• Edison's partner lied, perhaps, in final appearance
• The last penchant, perhaps
• Last act before death, like noble white bird
• Concluding appearance