The Piano Sonata No. 14 in C-sharp minor, (also known as the Moonlight Sonata), was a famous piece of classical music composed by Ludwig van Beethoven in the 19th century (1801).
In 2369, Captain Picard listens to Lt. Commander Nella Daren play Beethoven's "Piano Sonata No. 14" while at the fourth intersect in Jefferies tube 25, which she says is the most acoustically perfect spot on the ship. (TNG: "Lessons")