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Many users are facing problems in editing the mp3 tags. This can be easily done if they are having PC by making use of this app mp3 tag. It can be downloaded from here http://mp3tag.de/en/download.html .
If they don't have PC then also they can edit the tags by using this app in their handset itself. Its compatible with belle also. Its called Tag tools. I have attached this file just download and install it. Using this app you can change the album art image also.