http://daredreamermag.com/2011/02/23/how-to-legally-use-music-in-your-films-and-videos/

To me, music is the most important element of any video or film. No matter the subject matter, the music sets the mood, translates the images into feelings and leaves the viewer with a complete understanding of the whole piece. Even if your images are stunning, the wrong music choice will leave the viewer confused and unresponsive to the overall message. This article is full of ideas as to where to find the right music for your project. If you are looking to license a popular song it will step by step show you how to do it. Good stuff! And, if you just want to see how Spectrum Video makes the music work, feel free to check out our website at www.spectrumvideoandfilm.com