He studied violin and composition at the Prague Conservatory . AntonÃ n DvoÅ Ã k told him he should be a composer . While his younger brother Anton entered cadet school in Vienna to become a professional officer , Franz studied violin and composition at the Prague Conservatory , where his violin teacher was AntonÃ n Bennewitz , but was advised by AntonÃ n DvoÅ Ã k to focus on composing music .