That top note is killer.
Joan was well known for having an incredibly beautiful voice and for being totally incomprehensible. True story: My singing teacher was listening to he radio the day after she died, and they were playing an all day tribute to Joan. They played a song by her he had never heard before. At first he thought she was singing in Italian, then he thought it was German... no wait, Italian... it could be German... and so on. When the song ended, the announcer came on and revealed the song had been written by Handel, and was in English.
Another version by another great, the incomparable Leontyne Price.
You may now return to earth, and Merry Christmas.