"Moonlight" Sonata, Op. 27 No. 2: III. Presto agitato

After the calm first movement (Book 7A), a storm: rising arpeggios that end in two loud chords, again and again, in a full sonata form. A real concert piece; learn it in small sections at half speed, keeping the arpeggios even and the hand relaxed between the chords.

Source: Mutopia Project no. 276, typeset by Stewart Holmes (CC BY-SA 2.5).