Where is Fanart/Art stored (For Music) ?

You can add artist photos, artist-fanart, album cover and album-fanart besides your music files.
Then you only need the ‘Local Media Assets’ agent to be active.

This however requires that your music files are organised in a folder structure like this:

Music /
   Albumartistname /
      artist-poster.jpg         <--- a photo of the artist
      artist-background.jpg  <--- a background/wallpaper particular to the artist
      Albumartistname - Albumtitle /
         cover.jpg                 <--- album cover
         background.jpg       <--- album background/wallpaper [if not present, inherited from the 'albumartist' level]
         1. Trackartist - Tracktitle.mp3
         1. Trackartist - Tracktitle.txt
         2. Trackartist - Tracktitle.mp3
         2. Trackartist - Tracktitle.lrc
         ...

The graphic files can be in jpg, png, or tbn format. For all filenames there are a few alternative names which can also be used.

The txt files can contain the song lyrics in plain text format.
The lrc files can contain the ‘timed’ song lyrics.

After you added the files with the graphics, refresh the artist / the album. Then edit them and pick your own graphics from the choices presented.