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]](/Images/godic/202502/12/Beethoven_Piano_Sonata_14_-_title_page_18020000.jpg")
![Autograph score; the first page has evidently been lost. Click on image to examine all pages.](/Images/godic/202502/12/page1-400px-Manuscript_of_the_Piano_Sonata_No._14_in_C-sharp_minor_Op.27-2_by_Beethoven.pdf0000.jpg")
![](/Images/godic/202502/12/Beethoven_piano_sonata_14_mvmt_1_bar_1-4.svg0000.png")
![](/Images/godic/202502/12/Beethoven_piano_sonata_14_mvmt_2_bar_1-8.svg0000.png")
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.