I am looking for a software in linux, that will add the album-art/cover to each of the selected file in batch-mode.
The album art is a jpg/png stored in my computer. It will be awesome if it can import from internet. 
Currently I have tried both rhythmbox and banshee. I have also tried lame and easytag, but seems they do not support batchmode. lame is *not* adding the properties, but overwriting.(I know lame is the *only* command line s/w i have used so far).
so, basically I am looking for:
<some magic s/w> --picture=<my chosen picture> Music/Artist/*.mp3 
will add the picture to the metadata of the file, permanently.

Can you suggest me any such software?