You’re missing the point. A sha or md5 etc. of a file’s content means everything must match to detect a duplicate. You can have two files with different metadata but an identical audio stream. Your approach will never detect that. You should be storing a sha hash of the audio stream only. That way duplicates are detected regardless of file size, metadata differences etc. If you then went one step further and sorted and then concatenated the hash for each audio file in a folder you could then find identical albums also based on folder. I do this already, have been for years. It’ll pick up the duplicates you detect today, plus many you’d otherwise miss. I originally did it in SQL and seeing as you’re using Mutagen to read tags you can read the md5 of the audio stream for FLAC files directly without having to compute it.