| theres very few trailers that use their own music. in fact movie studios keep a huge selection in their music library that theyve paid x amount of money to be allowed to use liberaly without additional licenses for each time they throw it on another commericial or trailer.
youll find they have a generic sound library as well; its hard to tell sometimes but youll find the vast portion of sound effects are not unique except in very high budget movies (even than they will sample some) |