The World's Saddest Music
Written in 1936, it was originally part of the larger String Quartet No.1 Op. 11 and was composed in the arch form that uses the repetition in reverse order of musical elements to create a symmetrical whole.
It's pretty mournful stuff, and was played at the funerals of both FDR and JFK. But there is also a pensive, prayerful and reflective quality that give it great beauty. Here's a place to download the first third or so (about 7 minutes) of the piece.
So listen, reflect and enjoy.