Chopin Étude Op. 10, No. 3
Identified as "Tristesse" (Sadness), Chopin believed this melody to be his most beautiful one.
This is a video of me playing the Étude Op. 10, No. 3 when I was 13. (More than a decade ago)
By that time I had already passed Grade 8 piano with a distinction.
Hope you enjoy and let me know if you like to hear more.