I love the way music enhances a story. It's an important part of any video, but it shouldn't be solely relied upon to carry the emotional load. If the story is told well through the writing, cinematography, direction, and the editing, then the audience will feel the appropriate emotion. Leaning on the music to dictate an emotional response that otherwise can’t be earned is manipulative. Concentrate first and foremost on telling a good story, then find the right piece of music to fit the mood and pacing you have already established. The video will be stronger as a result.