Samuel Barber- Adagio for strings
http://www.youtube.com/watch?v=izQsgE0L450
Chopin- Prelude in E minor, Nocturne (anything Chopin)
http://www.youtube.com/watch?v=HiwPzHJ-Pic
I Love Rachmaninov too (love piano music full stop)
http://www.youtube.com/watch?v=x8l37utZxMQ
Beethoven- moonlight sonata
http://www.youtube.com/watch?v=oFSRs7iqAv8
Franz Schubert - Piano Trio No 2 in E flat major
http://www.youtube.com/watch?v=06cvLKfShO0
Beautiful
Some moderner stuff...
Henryk Gorecki
http://www.youtube.com/watch?v=brotY-aMCBE
and very modern
Soap and Skin- Cry Wolf
http://www.youtube.com/watch?v=E9KkdAzWoCI
Soap and Skin- the Sun
http://www.youtube.com/watch?v=Yw71o2dVNTw