Curt L. has entertained and educated us with puzzles about plants, flowers, shrubs. I thought I'd try this and see how long it takes for a reader to come up with the answer.
This early 19th century European composer was also a gifted pianist, as was her brother. Although her father Abraham, a banker, provided for this composer’s education as well as her brother’s, he adamantly refused to have her become a concert pianist because that was not the proper role of a woman. A gifted composer herself, her brother is much better known. Her father wrote to her, “Music will perhaps become his profession, while for you it can and must be only an ornament". “His”, of course, referred to her brother. She apparently performed on piano only once, and at that time she played a composition written by her brother. Over the course of her career she composed 466 pieces. Queen Victoria sang one which she especially liked, thinking it was her brother’s composition until he admitted that this composer had actually written it.
She married a painter and they had one son. Like their parents, this composer and her brother died of strokes.