Lets take for example track A and track 1. When I initially got track A I categorized it at playlists, according to my knowledge of its metadata and the feeling when was listened, as
"Buzón" (composer), "Buzon, Lyrical" , "40's"
Then I acquired track 1, which was a better rip (from vinyl), and maybe of higher bitrate version of the same recording. Unaware of the existence of Track A, and also the knowledge of Track's 1 metadata, I also categorized this track at playlists as
"Falcon" (the singer), "Falcon, lyrical" "40's"
Now that I recheck my collection I find out that I need to keep Track 1 with its playlists and also replace it at Track A's playlists. So I need track 1 to be at playlists:
"Falcon" (the singer), "Falcon, lyrical" "40's" , "Buzón" (composer), "Buzon, Lyrical"
Of course I can do it manually, but when it comes to more than 3500 files (which I use more frequently at this time), I would prefer if possible a quicker method...
Also, today I am finishing the two playlists "Source" and "New", which means that I have found of each track its best replacement.