Edward Elgar
In 1899 Elgar wrote an orchestral piece called the Enigma Variations. There is a main tune, and then a series of variations on the tune. Each variation describes one of his friends, but he did not say which friends they were: he only put their initials or nickname at the top of each variation. This is why the piece is an enigma (a “puzzle” or “secret”). People have managed to work out who each friend was, but the meaning of the main tune is still a puzzle. This music made Elgar very famous.