Moonlight Sonata
From Memory Alpha, the free Star Trek reference
The "Moonlight" Sonata, properly known as Piano Sonata No. 14 in C sharp minor, is a musical work composed by Ludwig van Beethoven in the early 19th century.
Nella Daren played a small excerpt of the first movement (Adagio sostenuto) on her Mataline II piano in a Jefferies tube aboard the USS Enterprise-D in 2369. (TNG: "Lessons")
