"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.
"Sacrimony". Not only does Tommy do amazing on vocals, it also has the vocals of Alissa White-Gluz and Elize Ryd, as well as an epic instrumental.