itunes question

hi,
hope right place this.
have large amount of music in itunes. of burned off of cds sold.
have found alarming amount of duplication of same tracks in itunes.
there program can run itunes through eliminate duplicates.
tried small sample of music files run through several different programs few years ago.
eliminate same track same band if 1 live version different length.

there better/more sensitive programs out there now?
thanks,
pwpw
-i'm looking @ 800gb of music.

 

did use display duplicates option in itunes?

 

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