Adagio for Strings by Samuel Barber
considered by many to be the most beautiful piece of music ever written. voted the "saddest work" ever in classical music, and the highest selling classical piece on itunes. played at the funerals of fdr, jfk, and princess grace.
check it out-
Adagio for Strings
If ten minutes is too long for you, skip to 6:00 and just listen for a minute.
(also, ignore video)