Collapse the light into earth by Porcupine Tree
it'd make me cry at a funeral, so I'd hope it'd do the same to everyone else there.

or Forever Autumn by Justin Hayward

or Damage Inc. by Metallica

Edit: I'd quite like to make people listen to something really long and really good when they have no choice but to sit and listen. So possibly:
Arriving somewhere but not here - Porcupine Tree
Rime of the Ancient Mariner - Iron Maiden
Echoes - Pink Floyd
( Vipros. clever got me this far, then tricky got me in, Wed 1 Jul 2009, 9:19, 2 replies, latest was 17 years ago)

Also a big Porcupine Tree fan
Die of a drug overdose and have Voyage 34 played.
( The Light in Chains don't touch the Pope's boner, Wed 1 Jul 2009, 10:03, Reply)

Loving the choises
Echoes would be amazing, especially if it was going when they brought you out as such
(Is this a good idea? ... Yes this is definitely a good idea, Wed 1 Jul 2009, 11:39, Reply)