I have been unearthing the story of the Davies sisters for a few weeks now, and it is a truly astounding one. Marianne or Mary Anne, was born in London in 1745 and soon became a musical prodigy on harpsichord before discovering Franklin’s glass harmonica and becoming a virtuoso on it. She taught her sister how to sing, and Cecilia became the first English Prima Donna in Italy before returning to London to star in her homeland. They were friends of Mozart and Mesmer so are responsible for the eerie music attached to the supernatural, and taught music to three European queens as well as composing music in their own rights.
The following link tells the rest: