The original composition by Sousa written in 1886, who according to Wikipedia died on March 6, 1932, is in the public domain in most, possibly all countries, with the exception of Cote d'Ivoire. Please check and obey the copyright laws of your country and do not download in countries where the original work by Sousa is not in the public domain (at the time of writing this, not to be used in Cote d'Ivoire).