For Memorial Day:
This piece is the greatest memorial I know of to those lost to war. If you have not heard this before, please listen. It is deeply moving, difficult, and beautiful.
War Requiem, by Benjamin Britten
This is the first recording of the piece from 1963, and many consider it still the best.
https://www.youtube.com/playlist?list=OLAK5uy_l_oH74NzF6HF_CoWgDgExohE5Cy4sfsrY&feature=share
Detailed description of the recording:
https://en.m.wikipedia.org/wiki/Britten%27s_War_Requiem_(1963_recording)
Mini-documentary on the piece:
https://youtu.be/kalQ05CXqbk