Can somebody tell me how to edit a video and extract audio from it? - Quora
File Menu: Export - Audacity Manual
Scribl - Audacity: File Processing
How to Record Audio and Save as MP3 File using Audacity
Audacity tutorial: Converting to mp3 or AAC and other formats, example: Matthew Smith - epic orchestral synth music for film and game effects; Buanzo's LAME mp3 library
Audacity File To Mp3 Converter Online - fasrexotic