The Piano Sonata No. 14 in C-sharp minor, marked Quasi
una fantasia, Op. 27, No. 2, is a piano sonata by
Ludwig van Beethoven. It was completed in 1801 and
dedicated in 1802 to his pupil Countess Giulietta
Guicciardi. The popular name Moonlight Sonata goes back
to a critic's remark after Beethoven's death.
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