Imagine you have a song lacking inner beauty, eg with low bitrate or hissing/crackling noises, etc. In return, it shows off a perfect physic shaped by you to fullfill your wildest dreams (carefully crafted id3 tags).
So you buys a copy that possesses a purest soul (crystal clear 320kbps) ... only to realize that it needs plastic surgery to make it look like the original.
Replica is a software that can help you having it both ways by cloning id3 metadata from the original file to the copy.
replica -u Library/Sam_Cooke-Ain_t_that_good_news-128kbps-2003 Incoming/sam_cook-good-news-320kbps Cloning id3 metadata... Done Renaming files......... Done
Depending on your music player, you may want to use the -u option which remove the source files and replace them by their upgraded version. This seemless substitution enables to keep third-party information (as ratings or play counts) untouched.
Replica modifies mp3 files with no provision provided to undo the changes. I would highly recommend a backup of your mp3 prior to running replica on them.
You can install replica by typing pip install replica.