"Love You To Death", the perfect balance between heartwarming and heartbreaking.
"A Feast for the Vain", certainly. A grand, classical-sounding song with Khan's totally sexy Mephisto voice in it. "Drowned in ecstasy", indeed.
"Prodigal Son", the climax of Silverthorn. Tommy Kaverik really shines here, particularly in "Part I: The Funerale".
"Soul Society" from The Black Halo - an amazing, soaring piece about the afterlife. The positively uncanny likeness of the song's lyrics to the premise of Bleach only sweetens the deal for fans of shonen anime and manga.