Please describe the problem:
The filename stored in ~/.cache/album-art/$artist-$album.jpg uses only the ascii charaters (and spaces) from the strings and strips the other one. While this is mostly (if you discard the collisions that will happen) fine for files automatically download files, it is quite cumbersome for items manually added. 

A very good example is the album "Með suð í eyrum við spilum endalaust" from "Sigur Rós" for which the file name has to be " sigurrs-mesueyrumvispilumendalaust.jpg" to be correctly picked.

You get the expected results if you do this procedure, but since some ascii characters (parenthesis for example, see http://bugzilla.gnome.org/show_bug.cgi?id=520516) also pose a problem, you are stuck for another album from the same band, whose title is only parenthesis "()".

Why not use the full utf-8 characters since they are already used without any problems for the song files ?

Steps to reproduce:
1. tag an album name as "()", artist as "Sigur Rós"
2. add a ~/.cache/album-art/sigurrs-().jpg file


Actual results:
the jpg file is not picked by banshee as cover art for the album

Expected results:


Does this happen every time?


Other information: