What song is playing on the The Hangover trailer?

There's a couple that have been played in various trailers for the movie but here's the main two songs. The song playing at the :30 mark is called "Live Your Life". It's by T.I. featuring Rihanna off of the album Paper Trail by T.I. And the second song with the guitar riff is "Joker and the Thief" by Wolfmother. Hope this answers your question. - Joe