The three-movement Sonata Op.4 was written in 1946-7. In 1964 the middle movement (then titled ‘Larghetto’) was published by Columbia Music Co. It’s not clear why this was the only movement which was published, but we are now using the opportunity to publish the whole work. The Sonata is a lengthy work, by Duarte’s standards, standing at more than 400 bars and we are pleased to bring it forward to the guitar-playing community for study, performance and enjoyment.