Sor was prolific and, in his time, quite a popular composer. There was a great demand for him to compose material that was approachable by less skilled players. The resulting body of instructional studies he produced is not only noteworthy for its value to students of the guitar, but for its inherent musicality. Much of this work is organized in several opuses (in increasing order of difficulty): Opus 60 (25 lessons), Opus 44 (24 lessons), Opus 35 (24 exercises), Opus 31 (24 lessons), Opus 6 (12 studies) and Opus 29 (12 studies).

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