Before making a trailer you should know what soundtrack you're using because the music sets the mood of the trailer:D

How to get your music.

For music I just type the song onto youtube and then copy the url and paste it onto an MP3 convertor site. I type "youtube convertor' into google. And the first site which actually goes by the name of youtube MP3 is what I use, it's safe and virus free. 

Here are some links to MP3 convertor sites:

http://www.youtube-mp3.org

http://www.flvto.com

I know you can't copy them from here so just comment and I'll put the url in the comment section to.

 Trailer on the side>>>  was my 2nd attempt.. improvement from first attempt? (posted on the last chapter)