I have read in a couple of places that Chopin himself requested for his Prelude Op. 28 No. 4 to be played at his own funeral, but no citation was given. Now I know that the preludes No. 4 and No. 6 were played at Chopin's funeral; but did he actually request the Prelude No. 4 for his funeral?
Maurycy Karasowski says (bottom of p320, top of p321) that Chopin requested that the only music to be played at his funeral be the Mozart Requiem.