The Music:

The Trio from Morricone's The Good, the Bad and the Ugly
Starts off the trailer, and the glorious trumpet comes in when you see the Bride driving. The music ends when she says 'Kill Bill'.

Motorcycle Circus from Luis Bacalov's Summertime Killer (aka Navajo Joe)
Starts after the Bride winks, and is used throughout the first few 'questions', with various silent pauses. It stops just after the question 'What Could Possibly Stop Her' appears.

The rest of the trailer uses the remaining portion of 'The Trio' mentioned above.

N.B. The Bacalov track is on the Kill Bill Vol.2 Soundtrack.