"Moonlight" Sonata, Op. 27 No. 2: I. Adagio sostenuto

Beethoven called it a 'sonata like a fantasy'; the name 'Moonlight' came from a critic after his death. Triplets flow through the whole movement under a slow melody in the top voice: the melody sings, the triplets stay soft. Beethoven asks for the pedal throughout: change it with every harmony.

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