mp3 mono to stereo converter

i am looking for any free software which can convert mp3 mono songs to mp3 stereo,or any software which can extract music from mp3 mono files.

use Audacity

i dont think this would be effective. mono will remain mono

yeah you can't change mono to stereo, but yes you can change mono (1 channel) to mono (2 channels)

for audio editting Audacity is best

for videos use song vegas