I want to convert the song in wmp format to mp3 format, anyone know what software is can help me?

Thank you!

Farestars Audio Converter is a pretty one for that type of conversion.  I am sure there are others too.  See what others have to say.  

can u tell me more about that software? where can i get it?

Fairstars Audio Converter is a simple conversion software.  I think it is quite user-friendly.  You just add the file(s) you want to convert, select the output type, and click Start to begin conversion.  Of course you may also go to the option menu and select the output settings (bitrates...etc.).

It allows user to convert between WAV, APE, FLAC, OGG, VQF, MP3, and WMA formats.

It is not a freeware though:  http://www.fairstars.com/audioconverter