Artwork
From Muso wiki
Following any database commit, Muso will search for artwork for any new albums automatically. The order is:
1) Album folder's image file search - according to the file spec under Options / Artwork (if no filespec is defined, it will skip this step)
2) Embedded artwork search - it only searches for artwork in the first 3 album tracks, if none is found there it skips this step
3) Last.fm artwork search - only if the option "If no image is found locally, muso can search online resources" is ticked
4) Amazon artwork search - only if the option "If no image is found locally, muso can search online resources" is ticked