MADRID — Spanish singer-songwriter, politician, and author José Antonio Labordeta, a lifelong defender of democracy and his native region of Aragon, died yesterday from cancer. He was 75.

Mr. Labordeta died in a Zaragoza hospital after battling prostate cancer for four years, said Chunta Aragonesista, the political party he represented during two terms in Parliament. The party advocates for greater financial resources for Aragon and the protection of its environment and the Aragonese language.

Mr. Labordeta’s musical career began with the 1974 release of “Cantar y callar,’’ an album that showcased his prodemocracy convictions during the final months of the military dictatorship of Francisco Franco. His musical style combined traditional Aragonese tunes with modern Spanish folk melodies, and gained popularity throughout the country.

“He was a great Spaniard and a great patriot,’’ King Juan Carlos said.

Born in the Aragonese capital, Zaragoza, José Antonio Labordeta graduated from the city’s university and became a teacher while pursuing his musical, literary, and political interests.

He became a popular television presenter, hosting a series in which he explored — armed with a backpack, musical instrument, pen, and notepad — some of Spain’s most enchanting and intimate rural environments.

He represented Chunta Aragonesista in Aragon’s regional Parliament and was elected as a national lawmaker in 2000 and again in 2004.

Mr. Labordeta published poetry, novels, and travel articles.

He leaves his wife, Juana de Grandes, and daughters Ana, Angela, and Paula.