and most often it is a piece of music which is owned by the studio
producing the film.
 
On Mon, 21 Jul 1997, Ellen B. Edgerton wrote:
 
> 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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