Adding artwork has corrupted song
I was adding a .jpg image (600x600) to one of my songs by dragging and dropping it from my desktop to the little artwork viewer in iTunes (version 9.1.1) and my computer (MacBook Pro) froze for a few seconds whilst it was adding it. When the computer stopped its freezing, the artwork was completely black. I double-clicked on the song to play it and it no longer plays. All of my other songs are ok so I closed iTunes and restarted my computer but the song still doesn't play. (iTunes "plays" it but it won't go past 0:00 even though the play button turns into a pause button).
I "revealed" the song in Finder and it won't even play using QuickTime. The bitrate, size, etc are all in the "Get Info" window and are correct but the file is "dead".
Should I asume the song can never be fixed and delete it? (I have a backup) - but I'm concerned this could happen again.
Update: The song plays on my iPod touch with no sound and the cover is transparent in CoverFlow mode.
Mac OS X (10.6.3)