bliss

Fully automated album art management for digital music files... Saves time by automatically managing large music collections in accordance with rules decided by the user... Supports MP3s, FLACs, OGGs and more... Rather than, like with most 'tagging' software, editing individual music files to make sure your tags are correct, bliss approaches it from a different direction: you define rules by which your album art should be organised, and bliss makes sure all your music complies with those rules, all totally automated (or as automated as you want it to be).