songs in trailer

i kno the one towards the end of the trailer is "dont leave me..." but im trying to find the names of the other two-1.,at the beginning,when phillipe asks "did you ever hear of steve rubell...."-its a neat disco beat and 2.during the "not that shirt" scene where shane enters the club...i believe the lyrics are something like "livin it up,livin it up,oh yeah,friday night"

thanks