Someone here posted about the use of music in trailers.  It is not really
a "tactic" but a necessity.  Most of the time, a film's musical score is
not even written or recorded by the time a theatrical trailer is prepared.
So, obviously, a preexisting piece of music must be used.
 
You can find a rather complete list of music used in trailers at
http://www.filmmusic.com/music/trailers.html.
 
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