Batch Conversion to MP3

What do you do when you have several thousand songs in a multitude of formats ( ogg, mp3, wma, m4a, etc. ) and you need to have them in mp3 so you can upload them to a cloud based application ( amazon ) that doesn’t support most of them ?

blackwater # apt-get install soundconverter

On Linux I installed SoundConverter, added the top level directory, let it find them all and convert them.   Be sure to visit Edit->Settings first to be sure you are writing the results to the directory you want, that you are deleting or keeping the original files correctly etc.