Beethoven's Moonlight Sonata is his Piano Sonata No.14 in C-sharp minor, and its first movement is very famous. To arrange it for guitar (under the Spanish title "Claro de Luna") composer Francisco Tárrega transposed the music to D minor, and you should tune your guitar's low E-string to D. Below is a video of the sheet music being played in Sibelius, or scroll down to play the mp3 file and see the sheet music PDF. The sheet music, midi and mp3 files can also be downloaded using the links in the left-hand menu. On mfiles we also have Beethoven's original version of the moonlight sonata for piano solo and also an arrangement by Jim Paterson for B-flat Clarinet and Piano.
Here is a video of Beethoven's Moonlight Sonata (arranged for Guitar by Tárrega):
The audio controls below allow you to play the music or download Beethoven's Moonlight Sonata (arranged for Guitar by Tárrega) as an MP3 file.
The image below is the first page of the sheet music, and here you can download the full sheet music for Beethoven's Moonlight Sonata (arranged for Guitar by Tárrega) in PDF format.