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When I copied some music files from my computer to my phone via Explorer, they appeared twice on my Music+Videos, as if there were two of them. Both files can be played, and from the storage check I can tell that there is only one copy in fact.
How can I solve this problem?
I'm using Music+Videos app, and it's my only app to play music.
I know this problem. Maybe it will multiply again. The solution is very simple. First you back up all the songs. Then you should clear the thumbnail cache of Music. This will be hidden in Music folder of Phone memory. After you did this you can use Windows Phone's desktop app to sync the music. If you want to copy via Explorer you should rearrange your music folder structure as Music Folder > Artist Folder > Album Folder > Songs.
