NOTE: This whole bit is spoken (why they called it a song I'll never know)
SPIKE:
Come on, then. Sing.
MASKED HENCHMAN:
My master has the Slayer's sister
hostage at the Bronze because she summoned
him and at midnight he's going to take her
to the Underworld to be his queen.
GILES:
What does he want?
HENCHMAN:
Her.