How useless?
I downloaded Blis to try and find album art that goes missing. As it happens, it found no album art for any track or album, including all the albums that already have album art. I guess it is free, but what a bizarre waste of time! Adds zero value.
Can’t keep this open because there’s no measurable or voteable solution, but please also see my comment.
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I'll have to close this because there are no real voteable, actionable suggestions, but just to follow up...
There are a few reasons this might happen. I assume you are looking to fill in missing album artwork.
First, the cover art rule must be enabled for bliss to inspect the artwork. Click "Settings", "Add or change cover art" to enable the cover art rule, then "Apply rules".
If your albums or files already have artwork they will show if they are embedded or in an image file with the same name specified in the rule. Note that artwork in iTunes is NOT necessarily embedded - iTunes stores artwork in its own database.
If bliss sees artwork is missing it will look for it. Its automatic hitrate for mainstream-ish releases is about 80%. For other releases, you can use the change art page or "cover art alternatives" which uses looser queries.
Finally, feel free to follow up with our support email - http://www.blisshq.com/support/reporting-problems.html