I had been considering doing so for some time, since the remix is the more popular version, and thought it would be good to be able to differentiate recordings and remixes of each, but what pushed it over the edge for me was twofold:
first, I found an instrumental cover of specifically the Tombstone remix, then discovered that Tombstone credited himself as a composer on the YouTube Music release (and likely other streaming releases)
if you want some non-remix examples, I recently did a lot of work on all the variants of Gourmet Race which you might find helpful too
the main reason for most of these work versions is to relate them to their respective games, but since there’s two main versions of this theme (the original Gourmet Race and Fountain of Dreams from SSBM), each with works based on them, I thought it’d make sense to reflect that
if you wanna check out the different versions, here’s a great video compiling most if not all of them (up to 2015, that is)
example three is seperate because there’s several recordings of a particular arrangement, it’s White Christmas by The Drifters
I split this one out when I found that Elvis’ recording of the song followed the exact arrangement (tho different instrumentation), down to finishing off with a quick Jingle Bells quote. I also found at least two other recordings of the arrangement on YouTube, but those haven’t been added to MusicBrainz yet
that’s just how I’ve been operating so far, and I don’t know that anyone has much better (or at least I haven’t heard about it). for example, @Silver_Skree deals with a lot of Touhou arrangements and (to my knowledge) has worked it in much the same way