- "There have been many reports of the Philosopher's Stone over the centuries, but the only Stone currently in existence belongs to Mr Nicolas Flamel, the noted alchemist and opera lover. Mr Flamel, who celebrated his six hundred and sixty-fifth birthday last year, enjoys a quiet life in Devon with his wife, Perenelle (six hundred and fifty-eight)."
- —Book on Nicolas Flamel.[src]
After Luna Lovegood was bitten by a gnome during the Wedding of William Weasley and Fleur Delacour, her father suggested that she might feel an urge to sing opera or declaim in Mermish and that, if she did, she should not suppress it.
- Harry Potter and the Philosopher's Stone (Mentioned only)
- Harry Potter and the Deathly Hallows (Mentioned only)