Did you try dragging and dropping it in RhythymBox? It does full albums for my machine (only 10-15 tracks for me usually), but as I said I have no way of testing if the tags would stick for your player not just in RhythymBox. That draging and dropping album art while the track playing is pretty nifty. I have to give credit to iTunes for being the first place I saw that years ago, but I am very glad it was adopted into RhythymBox. It is the easiest and most intuitive way to change album art in most cases IMO.
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