Here's the words you can't read:
Left to right:
Severus as a Dementor
Maggie as Fleur the Veela
Bridget as Marilyn Monroe
Amanda as Audrey Hepburn
Lucius as Elton John
The lyrics to the song are:
Goodbye, Norma Jean, though I never knew you at all...
You had the grace to hold yourself, while those around you fall....