command line - Move all files of type to a new folder in windows 7

Can anyone help on this.

I have mp3 files all over the shop and therefore a lot of duplicates.

What i need is a command line function that will move all files of type mp3 to a new folder. I'm not worried if the files structure on the new folder is retained or not.

I could easily copy using copy c:*.mp3 /s c:\mp3 for example, but due to the amount of files i have i would run out of disk space copying them, hence the need to move.

Thanks