Jakob Ludwig Felix Mendelssohn Bartholdy ( born Hamburg 3 February 1809 ; died Leipzig 4 November 1847 ) was a German composer . Jakob Ludwig Felix Mendelssohn Bartholdy , born , and generally known in English-speaking countries , as Felix Mendelssohn ( 3 February 1809-4 November 1847 ) was a German composer , pianist , organist and conductor of the early Romantic period .