file wrangling help requested

[footfootfoot]

I've got a problem with one of my back up drives due to poor computer hygiene.

There are about 50,000 files on it, of which a huge number are duplicates residing in a series of nested folders.

For example,
L:\music\elvis costello\my aim is true has tracks 1,2,4,5,7,8,9

and
L:\music\itunes music\~E\elvis costello\my aim is true has tracks 1,2,3,6,10,11

and
L:\music\MISC Vinyl\elvis costello\my aim is true has a live version of track 3 with the same file name as track 3 above, but a different bit rate and time.

How can I get all these organized, deleting the dupes and not deleting the similarly named songs.

I've tried using digital volcano's Duplicate Cleaner with some success, but it still misses dupes when using MD5 or byte by byte, and it comes up with false positives when there are multiple versions of songs, especially a problem with greatest hits and compilation discs.

Any suggestions?