Open your web browser and navigate to the website of a free DVD to MP3 conversion tool. Several example applications are Free DVD MP3 Ripper, Free Video to MP3 Converter and DVD Audio Ripper (see Resources).
Download and install the software by following the step-by-step instructions provided in the installation package.
Start the DVD to MP3 conversion application by clicking "Start" > "All Programs" and selecting the application from its folder.
Insert your DVD into the DVD drive of your computer.
Select the source file you'd like to convert to an MP3 by clicking "Browse" and navigating to your DVD drive. Click once to highlight the file, then click "Open."
Use the sliders under the video preview to choose the clip you'd like to convert. When finished, click "Convert", "Rip" or your software's variation of that.
Name your MP3 file when the conversion is finished and save it to your desired location.