The Marcha Real ("Royal March") is the national anthem of Spain. It is one of only four national anthems (along with those of Bosnia, Herzegovina, Kosovo and San Marino) in the world to have no official lyrics.

One of the oldest in the world, the anthem was first printed in a document dated 1761 and entitled Libro de la Ordenanza de los Toques de Pífanos y Tambores que se tocan nuevamente en la Ynfantª Española (Book of the Ordenance of Newly Played Military Drum and Fife Calls by The Spanish Infantry), by Manuel de Espinosa. Here it is entitled La Marcha Granadera ("March of the Grenadiers"). According to this document, Manuel de Espinosa de los Monteros is the composer.

More Info: en.wikipedia.org