Listen to the following MP3 samples:

Piano Sonata, No. 8, in C Minor, Op. 13, No. 1 ("Pathetique")
I. Grave: Molto allegro e con brio [9.01] [mp3, sample]
II. Adagio cantabile [5.31] [mp3, sample]
III. Rondo: Allegro [4.43] [mp3, full]

Piano Sonata, No. 14, in C Sharp Minor, Op. 27, No. 2 ("Moonlight")
I. Adagio sustenuto [6.12] [mp3, full]
II. Allegretto [2.10] [mp3, sample]
III. Presto agitato [8.21] [mp3, sample]

Piano Sonata, No. 23, in F Minor, Op. 57 ("Appassionata")
I. Assai allegro [10.22] [mp3, sample]
II. Andante con moto [5.55] [mp3, sample]
III. Allegro ma non troppo: Presto [8.39] [mp3, full]