He studied at Piarists schools until 1945, when he entered the School of Law of the Universitat de Barcelona, earning his degree in 1949.
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In the 1960s he played a key role in the development of the Nova Cançó movement, cofounding the musical group Els Setze Jutges.
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In 1961 Espinàs was one of the founders, with Miquel Porter i Moix and Remei Margarit, of Els Setze Jutges.
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He also wrote and recorded a story for children, Viatge a la Lluna (Voyage to the Moon), with music by Xavier Montsalvatge.
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With Tots som iguals (1956), which appeared in English translation in the United States in 1961 as By nature equal, he gained international recognition, earning critical acclaim from the New York Herald Tribune, New York Times, and Washington Post and the magazine Book of the Month.
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