By soundtracks do you mean just music or all the sounds in movies? Are you a musician? Or if you did download loops can you put them together in such a way as to produce your own music? Making your own music is not easy, apart from getting it to sound right and fit in with the video, you have to stay away from the tempation to be influenced by other musicians, bands or singers or movie tracks. It is a entire art form in itself.

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