(covers information from several alternate timelines)
Frédéric-François Chopin was a 19th century Polish composer and pianist.
In 2368, Matthew, a boy living in a Human colony on Moab IV played Chopin's Prelude Number 4 on the piano during a concert for the colonists and the visiting crew of the USS Enterprise-D. (TNG: "The Masterpiece Society")
In 2369, his Trio in G minor was performed on the USS Enterprise-D with Data at the violin, Ensign Cheney at the cello and Nella Daren at the piano. (TNG: "Lessons")
In 2375, when Tom Paris mentioned he was "orchestrating" the antimatter flow aboard the Varro generational ship, B'Elanna Torres suggested that he should try some Chopin when he was finished. (VOY: "The Disease")
Two of his other works, Barcarolle in F-sharp major and Nocturne in E minor, were played by Seven of Nine in 2378. (VOY: "Human Error")
In 2401, Chopin's Nocturne No. 1 in B Major, Op. 32 played at a Deltan diplomatic dinner on Raritan IV. (PIC: "The Star Gazer")
In an alternate timeline 2401, Chopin's Nocturne No. 2 played as Seven of Nine was awakening from her sleep and walking about her bedroom. (PIC: "Penance")