Not sure about the 'best way', but I use TuneUp to find metadata/artwork for audio files that were NOT ripped by iTunes. [note: Get Album Artwork function in iTUnes only works when iTunes is used to 'rip' the files]
Not sure about the 'best way', but I use TuneUp to find metadata/artwork for audio files that were NOT ripped by iTunes. [note: Get Album Artwork function in iTUnes only works when iTunes is used to 'rip' the files]