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The piano Sonata No. 14 in C sharp minor, Op. 27, No. 2 (known as "moonlight") is a musical work written by the German composer Ludwig van Beethoven in 1800-1801. The Sonata is dedicated to 18-year-old Giulietta Guicciardi, who was given music lessons by Beethoven in 1801. The composer was in love with the young Countess and wanted to marry her.