Information for Fanny at The Watermill Theatre, Newbury (Play). The true story of the other Mendelssohn. You'll probably know her younger brother, Felix Mendelssohn, from 19th century smash hits like The Wedding March. He was the Cliff Richard of his day and was even asked to play at a personal concert for Queen Victoria. But only if he played her favourite piece of music ever, a song called Italien. However, we now know that Felix was forced to admit to the Queen that, in actuality, the piece had been composed by his sister, Fanny, and simply published under his name.