Piano Sonata No. 14 (Beethoven)
![Title page of the first edition of the score, published in 1802 in Vienna by Giovanni Cappi e Comp.[1]](/uploads/202502/12/Beethoven_Piano_Sonata_14_-_title_page_18020000.jpg)
The Piano Sonata No. 14 in C-sharp minor "Quasi una fantasia", Op. 27, No. 2, popularly known as the Moonlight Sonata, is a piano sonata by Ludwig van Beethoven. It was completed in 1801 and dedicated in 1802 to his pupil, Countess Giulietta Guicciardi.