Question Comparing audio files by sound, not bits/bytes

[tcsenter]

Know of an (free or not very pricey) app/prog that will compare/identify duplicate or extremely similar (adjustable sensitivity) song/track files based on sound or acoustic analysis/content, not a binary bit/byte duplicate?

 

[tcsenter]

OK answering my own question! Appears that Similarity and DeDupe are two apps that are written for such a purpose. I have not tried either as of this post. The feature as I understand is called acoustic or audible fingerprint recognition or analysis,. Isn't this what Gracenote used to do?