If you want a video clip of audio and video tracks separately for music files only or need to add another track to the original video frame, follow this tutorial to find out how easily separate audio and video clips for a single tone rail.
Step 1: to be separated is loaded into the audio video MovieMator
Step 2: Add the video file to the video track in the timeline
Step 3: separating the video clip from the audio file
, click on the main interface "Export " button, and then select a The audio file format to export. Then you will get a separate audio file. There are five audio formats for you to choose: AAC, MP3, OGG, WAV , WMA. Click "Export" button, from the "Audio" to select the desired audio format in the format list. After that, you can see select "Disable Video" option, which means that you can export a separate audio file. 
Step 4: Save the file to a separate audio Finder
After completing the above steps, click "Export File" to export the folder you need to change in accordance with, and then click "Save" to start processing the video. You need to do is to wait until the process is complete. 
Now you successfully separate audio files and video clips, you can enjoy the music or audio files to add to this another video frames anytime, anywhere. If you want to add this audio file to another video frame, simply create a new project and add the audio file to represent audio tracks.