...Ultimately this program will let you delete duplicates from either the left or right trees, or copy non-duplicated files from one tree to the other. However until the matching code gets a lot more reliable the only action allowed is to export the list of files suspected to be duplicated in both trees.
(Prerequisite: uses the `Mutagen' library to process ID3 data and `wx' for the UI.)
The latest code is always available via `git' but since there's undoubtedly a lot of bugs right now pre-packaged .ZIP files will only be made available for `big' changes.