Sorry to be a bit late to the party here. The music Aria plays in Ch. 5 is in fact the oldest piece of music known to survive with complete words and music, the Epitaph of Seikilos, nearly 2000 years old. The text, copied below, is particularly relevant. It's a pretty pithy encapsulation of a vampire's outlook on relationships with humans:
Ὅσον ζῇς φαίνου
μηδὲν ὅλως σὺ λυποῦ
πρὸς ὀλίγον ἔστι[2] τὸ ζῆν
τὸ τέλος ὁ χρόνος ἀπαιτεῖ
Wikipedia's loose English translation:
While you live, shine
have no grief at all
life exists only for a short while
and Time demands his due
