The composer Alfredo Keil died at the age of 57. Here is all you want to know, and more!
Biography - A Short Wiki
Composed the Portuguese national anthem, “A Portuguesa,” in 1891, although it was not adopted until four years after his death. The lyrics were penned by poet and playwright Henrique Lopes de Mendonça.
He was born to Johann Christian Keil and Maria Josefina Stellflug.