Audacity is a free, open source audio software that allows you to record, edit, and export audio files. The document provides instructions on how to use Audacity to record and save a narration, including how to start and stop recording, pause recording, and export the finished recording as an MP3 or WAV file. It notes that audio quality is extremely important and other recording programs besides Audacity can be used. The document also recommends using royalty-free music from specific sites that have appropriate Creative Commons licenses.