This study is in A minor but "modulates" (changes key) to A major in the middle section, giving it an uplifting, joyful feel.
Notice Sor's use of the "cycle of fifths" in bars 13-16 (see PDF below). Here the harmony goes D minor ⇒ G ⇒ C ⇒ F ⇒ B diminished ⇒ E ⇒ A minor.
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