There are many ways to convert files WMA to MP3, but here I will show for you using ffmpeg. It is simple and follows the same concept in How to convert YouTube video to mpeg.
Before continue you need to have mp3 codec enabled in ffmpeg. Case you haven’t, access this post How to compile and install ffmpeg in Ubuntu 11.04 to enable it.
Open a terminal and type:
ffmpeg -i [file.wma] -acodec libmp3lame -ab 128k [file.mp3]
ffmpeg -i music.wma -acodec libmp3lame -ab 128k music.mp3
That’s it. See you next time