Songs about passing of time, passing away

[Wojtek]

One of the most fascinating cultural differences I know is the one connected with celebrating Halloween/All Saints Day. Here in Poland on that days we are visiting realtives', friends' tombs, lighting candles. Cementaries are very beautiful then (flowers, sparkling lights at evening and in the night). So it's just the opposite to the Halloween atmosphere.

I need your help. I may have occassion to dj an event connected with songs about passing of time, passing by, death, loneliness after losing dearest person, songs with atmosphere of reflection, meditation, songs in pensive mood. If you know prog songs meeting such criteria please help me.

I've already found a few (eg. Mostly Autumn's, Pain of Salvation's, Opeth's) but knowing mainly modern prog I don't want to miss old great prog songs.
And of course I don't know whole modern scene so if you know any prog tracks connected with topics mentioned above I'll be grateful for that.
Thanks in advance.