Songs to die to...

[Vincent]

Sound of Silence has been mentioned. Some other possible choices assuming it'll be an introspective death.

Sigur Ros - Staralfur
Erik Satie - Trois Gymnopedie
George Winston - Summer: Lullaby
Royksopp - Remind Me
Thomas Newman - Road to Perdition Theme

Probably a bunch of others too. I wouldn't mind listening to any song that I enjoy and/or gets me upbeat also.
Bruce Springsteen - Glory Days
The Killers - All These Things That I've Done
Jay Z - Numb Encore
Infadels - Love Like Semtex
Guano Apes - Open Your Eyes
This list could go on til I die...