With QuickTime Player, you are able to rip audio from videos, well providing the format is supported by QuickTime.
1. Hold ‘ctrl’ and click on the video, selecting ‘Open With’ – you need to open your video with QuickTime Player 10 not 7 and if you do not have 10 then you will not be able to do this.
2. Click ‘File’ and then ‘Export’
3. On the pop up window, click the drop down by ‘Format’ and then click ‘Audio Only’. Name it what you choose and click ‘Export’
4. The audio from the video will appear and an .m4a audio file on your desktop
This method can be used for piracy, which is illegal, so make sure that you use this responsibly.