Frédéric Chopin composed Waltz Op. 69, No. 2 for solo piano in 1829 at the age of 19 and was published posthumously posthumously in 1855 by his friend Julian Fontana. It is a melancholic piece marked with Moderato tempo and three different sections and melodies which change to B major before reverting back to the original theme.

Can you believe this was composed by a 19 year old? Fuckin genius

Frédéric François Chopin[n 1] (born Fryderyk Franciszek Chopin;[n 2][n 3] 1 March 1810 – 17 October 1849) was a Polish composer and virtuoso pianist of the Romantic period, who wrote primarily for solo piano. He has maintained worldwide renown as a leading musician of his era, one whose "poetic genius was based on a professional technique that was without equal in his generation"